Upload
anurag-katiyar
View
94
Download
2
Embed Size (px)
DESCRIPTION
This is the summary of the famous novel 'The Goal' based on the journey of an executive to regain the long lost fortune of his manufacturing organization. The book comprises of the concepts of supply chain management which have been presented in a very detailed manner through a story narration.
Citation preview
1. GENESIS OF ‘THE GOAL’1. GENESIS OF ‘THE GOAL’
The Goal is about science and education. The author believes that these two words have been
abused to the extent that their original meanings have been lost in a fog of too much respect
and mystery. Science for him is not about the secrets of nature or even about truths. Science
is simply the method to try and postulate a minimum set of assumptions that can explain,
through a straightforward logical derivation, the existence of many phenomena of nature. For
example the Law of Conservation of Energy of physics is not truth. It is just an assumption
that is valid in explaining a tremendous amount of natural phenomena. Such an assumption
can never be proven since even though an infinite number of phenomena that can be
explained by it. On the other hand, it can be disproved by just a single phenomenon that
cannot be explained by the assumption. This disproving does not detract from the validity of
the assumption. It just highlights the need or even the existence of another assumption that is
more valid. This is the case with the assumption of the conservation of energy, which was
replaced by Einstein's global-more valid -postulation of the conservation of energy and mass.
Einstein's assumption is not true to the same extent that the previous one was not "true".
The author believes that we have restricted the connotation of science to a very selective,
limited assemblage of natural phenomena. We refer to science when we deal with physics,
chemistry or biology.
This book is an attempt to show that we can postulate a very small number of assumptions
and utilise them to explain a very large spectrum of industrial phenomena.
What the author has attempted to show with this book is that no exceptional brainpower is
needed to construct a new science or to expand on an existing one. What is needed is just the
courage to face inconsistencies and to avoid running away from them just because "that's the
way it was always done". The author has also dared to interweave into the book a family life
struggle, which he assumes is quite familiar to any manager who is to some extent obsessed
with his work.
The author has also attempted to show in the book the meaning of education. The author
sincerely believes that the only way we can learn is through our deductive process.
Presenting us with final conclusions is not a way that we learn. At best it is a way that we are
trained. That's why he has tried to deliver the message contained in the book in the Socratic
way. The author believes that our textbooks should not present us with a series of end results
but rather a plot that enables the reader to go through the deduction process himself.
2
2. INTRODUCTION TO ‘THE GOAL’2. INTRODUCTION TO ‘THE GOAL’
The Goal is about new global principles of manufacturing. It’s about people trying to
understand what makes their world tick so that they can make it better. As they think
logically and consistently about their problems they are able to determine “cause and effect “
relationship between their actions and results. In the process they deduce some basic
principles, which they use to save their plant and make it successful.
In today's manufacturing society production management is one of the most crucial ideals to
stay competitive in the market place. In our competitive manufacturing industry if a plant
does not satisfy customer's wants and needs their sales and profits will suffer and
management may end up pulling the plug if sales continue to decrease.
The book covers the following topics in great detail:
Communication;
Inventory; Bottlenecks;
Efficiency; and
Capacity Planning.
There are several reasons why the author chose a novel to explain his understanding of
manufacturing – how it works and why it works that way in reality. Firstly, he wants to make
the global principles of manufacturing more understandable and show how they can bring
order to the chaos that so often exists in our plants. Secondly, he wanted to illustrate the
power of this understanding and the benefits it can bring. The results achieved by the
exercise are not fantasy - they have been and are being achieved in real plants. The author
hopes that the readers would see the validity and the value of these principles in other
organizations such as banks, hospitals, insurance companies and our families. He believes
that the same potential for growth and improvement exists in all organizations. Finally and
most importantly the author wanted to show that we can all be an outstanding scientist. The
secret of being a good scientist lies not in brainpower but simply the need to look at reality
and think logically and precisely about what we see. The key ingredient is to have courage to
face inconsistencies between what we see and deduce and the way things are done. This
3
challenging of basic assumption is essential to break through. For example almost everyone
who has worked in a plant is uneasy about the use of cost accounting efficiencies to control
our actions. Yet few have challenged this sacred cow directly.
The basic story is built around the dilemmas facing Alex Rogo, a plant manager in charge of
an injection moulding plant a division at Bearington of his company UniCo. Alex Rogo is a
harried plant manager working ever more desperately to try and improve performance. His
factory is rapidly heading for disaster and so is his marriage. He has ninety days to save his
plant or it will be closed by the corporate HQ resulting in hundreds of job losses. The plant
can't seem to ship its orders on time and it's losing money. Alex is at a loss for what to do
until he pulls out a cigar that Jonah, a physicist from Israel, had recently given him. That
cigar reminds him to contact Jonah for possible help. From there, the path to recovery begins.
3. ABOUT THE AUTHOR3. ABOUT THE AUTHOR
Eli Goldratt`s ten year old crusade to change manufacturing from an art to a science is
bearing fruit. Eli’s reputation as a slaughterer of sacred cows began in 1979 when the
introduction of his computerized scheduling system disproved that myth that finite
scheduling doesn’t work. Its seems appropriate that Eli who is a man characterized as
unconventional but also full of common sense should disguise The Goal; a manufacturing
textbook as a novel. Its also fitting that it should become an underground best seller in
boardrooms, universities and on factory floors. However it was not anticipated that the Goal
would be passed along to and avidly read by spouses. Nor was it anticipated that people in
more than a dozen different countries would claim that the book was written about their plant
and their families.
4
4. CHARACTERS IN ‘THE GOAL’4. CHARACTERS IN ‘THE GOAL’
NAME OF CHARACTER ROLE IN THE BOOK
Alex Rogo Plant Manager – Uni Ware Co. at Bearington
Julie Rogo Alex Rogo`s wife
Dave and Sharon His Children
Jonah Physicist/Consultant
Bill Peach VP at UniCo (Alex Rogo’s Boss)
Lou Accountant at Bearington Factory
Bob Donovan Production Manager at Bearington Factory
Stacey Potazenik Inventory Controller at Bearington Factory
Ralph Nakamura System Analyst at Bearington Factory
Herbie & Ron Boys on the trek
5
5. CHAPTER I 5. CHAPTER I
THE BAD NEWS
The first chapter of this book describes the difficult situation Alex`s plant is in. Everything in
the plant is late. Orders are never shipped on time. In fact based on his observation Alex has
categorised all the orders that are behind schedule as being either Do It Now, Red hot, Very
hot or Hot depending upon their priority for dispatch.
During this period Alex's superior Bill Peach comes to the plant to make sure the operation
are running smoothly as planned and to check on an important order for a client which
happens to be UniCo. biggest customer. The order has been considerably delayed upsetting
the client. In an attempt to retain the client Bill promises to personally look into the status of
the order.
A visibly upset Bill takes Alex to task and asks him the reason as to why orders are getting
delayed. Alex blames the second round of layoffs that the Company carried out to reduce
costs for the delay as they have placed severe constraints on the plant functioning. However
Bill and the management believe that Alex has enough people to build the products on
schedule. According to Bill the plant is no longer the money maker it should be and that he
would have no choice but to close the facility down. Bill gives Alex three months to get the
plant running. Either the plant shapes up or the plant will be closed and everyone will lose
their jobs including Alex.
At the plant for some reason orders have not been on time. They are usually caught up in a
bottleneck somewhere. In fact many orders as of late have been so far behind that now it is a
major problem for the company and the lively hood of the workers. His company that he
works for is losing money. For the past couple of years the company has continued losing
money now it is his turn to change things around.
Thus in the first chapter we are made aware of the difficulties that Alex is facing and the
ultimatum that Bill has delivered to him regarding the future of the plant.
6
6. CHAPTER II6. CHAPTER II
STRESS ON FAMILY LIFE
One of the key features of this book is that the author has very realistically interweaved
family life and professional life. Today most of the managers at all levels of the organization
complain about the amount of hours they need to put into their jobs, just to be secure about
the job. This stress exerts intense pressure on ones family life. Alex being the plant manager
is going through a similar situation.
With all the problems with the plant, Alex hardly finds anytime for his wife and kids. This
situation has escalated to a point where Alex hardly gets to see in kids and is driving his
marriage towards disaster. The situation is further aggravated due to the fact that, Julie hates
the town of Bearington and doesn’t want to stay there. Alex on the other hand is attached to
the town as he was born and raised in Bearington. He feels he is at home and also has a sense
of ownership towards the town.
THE INTROSPECTION
According to Alex the real issue for him today is to save a manufacturing plant on the critical
list within three months before Bill pulls the plug on the factory. This meant that Alex would
have probably two or three monthly reports to change Bill’s mind failing which the plant
would be shut down without giving him time to complete his backlog and 600 people will
head for the unemployment lines. Alex tries to analyse the situation as to why can’t they
consistently deliver a quality product out of the factory on time and at a cost which would
beat the competition inspite having a good plant, the latest technology, the best n/c machines
that money, robots and a computer system. Alex feels that the fierce competition from the
Japanese is the main cause. Earlier the Japanese were beating the Americans on quality and
product design and now they are beating on the basis of price and deliveries. Alex also feels
that he has already done enough of cost reduction and there is nothing left to trim.
Finally Alex reaches a conclusion that the division has to do something about the late orders,
reduce need of expeditors, and stacks and stacks of inventory in the warehouse and most
importantly to stop losing money.
7
7. CHAPTER III7. CHAPTER III
PENNY WISE POUND FOOLISH
“Penny wise Pound Foolish” is an age-old adage. Today companies are so obsessed with cost
cutting in all possible minor ways that sometimes they land up spending a bomb trying to cut
trivial costs. This becomes evident in UniCo when Alex has to go for a meeting to the
Company’s HQ at 8.00 am in the morning. According to Alex the irony of calling an early
morning meeting when the Company is on a cost cutting drive is that half of the people
attending the meeting will have to fly in the night before, which means hotels bills and extra
meals. So in order to inform the divisions that they are not performing well and not making
money, UniCo is going to pay a couple of grand more than they would have to pay if they
begun the meeting an hour or two later.
THE CRISIS
Before the start of the meeting Alex comes to know the real reason for Bill’s sudden outburst
and change in behaviour. Nathan Selwin one of Bills assistant informs him that not just his
factory but also the whole division, which Bill heads would be, shut down in case Bill is
unable to make a turnaround and improve performance before the end of the year. This meant
that if the division went so would Bill’s job.
Bill was Alex’s immediate superior at the time he joined UniCo. It was Bill who recognized
Alex`s potential and promoted him to plant manager of the Bearington Factory. Bill then was
a very different man. He was confident and wasn’t afraid to delegate his responsibility. He
would allow an employee to run his own show as long as the employee contributed to the
bottom line of the company. He tried to be an enlightened manager and was open to new
ideas. But as sales reduced, competition intensified and budgets started becoming more and
more conservative, so did Bill attitude.
Bill started to lose his rationality due to all the crisis that UniCo was facing. He over reacts to
even petty issues and Alex compares Bills current state to that of a general who knows he is
losing the battle, but forgets his strategy in his desperation to win.
8
8. CHAPTER IV8. CHAPTER IV
THE FATEFUL MEETING
Chapter IV of the book is the most crucial and the turning point in the fate of the plant and
Alex. This chapter describes the meeting between Alex and Jonah and how this meeting sets
the ball rolling on the path of recovery.
A cigar in his suit pocket reminds Alex of his fateful meeting with his old time physics
professor Jonah at the O’Hare Airport. Alex who is on his way to Houston to attend a
seminar on “Robotics: Solution for the Eighties to America’s Productivity Crisis” informs
Jonah that his plant also makes use of robots in certain departments which have increased
productivity by thirty six percent in the areas where they are installed.
Jonah however bombards Alex with a serious of fundamental questions such as:
Is his plant now making thirty six percent more money than before?
Was his plant able to ship even one more product per day as a result of increase in
efficiencies in the department where robots are installed?
Did he lay off any people and thereby reducing people’s expenses due to installation of
the robots?
Did the inventories of the plant go down?
Does he ship his products on time meeting all the delivery and shipment dates?
When Alex replies in negative to all the above questions Jonah says that in case the
inventories haven’t done down, employee expenses haven’t reduced and the company isn’t
selling more products or is not meeting shipping dates, then it is wrong for Alex to claim that
the robots have increased the plant’s productivity. Further Jonah claims that Alex is running
a highly inefficient plant and that just like everybody else in the world, he has accepted so
many things without question and that he is not thinking at all.
9
THE TURNING POINT
Alex is stunned at Jonah’s blunt but shockingly true statements. He wants to know how
Jonah could without even knowing or coming to his plant make such accurate judgments
about his plant. Jonah tells Alex that what is happening in his plant is today a universal
phenomenon and inquires why does Alex believe that the robots are such a great
improvement. Alex believes that robots are a great improvement because they have increased
productivity.
Jonah then asks Alex to define productivity in a lay mans terms. Alex rightly defines
productivity as:
“Accomplishing something in terms of goals.”
Jonah further adds that,
“Productivity is the act of bringing a company closer to its goal. Every action that brings a
company closer to its goal is productive and every action that does not bring it closer to its
goal is not productive.”
However productivity is meaningless unless one knows what is his goal and the problem with
Alex is that he doesn’t know what is his goal and until then he is just playing a lot of games
with numbers and words.
Jonah advices Alex to think about what his goal is and gives him a clue that no matter what
the company, there is always only one goal to be achieved.
10
9. CHAPTER V & VI9. CHAPTER V & VI
DISCOVERING THE GOAL
This chapter describes the step-by-step process by which Alex tries to define the goal of his
company accurately. Keeping in mind that Jonah had said that there is only one goal, Alex
tries to identify the goal by considering each of the departments in his plant. He starts with:
PURCHASE
One of the things that a manufacturing organization must do is buy raw materials to produce
the required final products. So is cost effective purchasing of raw materials the goal of the
company? Alex rejects this hypothesis considering the fact that his purchase department is in
the process of renting out more warehouses to stock all the crap that they are buying so cost
effectively which has resulted in a 32 month supply of copper wire, 7 month supply of
stainless steel and millions and millions of money tied up in other stuff and all bought at
terrific prices and all this has not helped the plant in any way.
HUMAN RESOURCES
UniCo. employs people by thousands and people are supposed to be its most important asset.
So is supplying jobs and looking after its employees its goal? However in the last one year
UniCo has ruthlessly laid off a bulk of its staff nor does it provide lifetime employment to
anybody unlike the Japanese companies. Besides the plant isn’t built for the purpose of
paying wages and giving people something to do and so employee’s welfare is not the goal.
QUALITY
Is quality the goal? Because if one doesn’t manufacture a quality product all that one gets at
the end is a bunch of expensive mistakes and before long there would be no business and
clients. However Alex knows that his plant does no compromise on quality and is still
making losses and if quality were truly the goal, then how come a company likes Rolls
Royce very nearly went bankrupt. Hence quality alone cannot be the goal.
11
EFFICIENCY & QUALITY
Alex decides quality alone cannot be the goal because of costs. If low cost production is
essential, then efficiency would be the goal, or rather both hand in hand i.e. the fewer errors
made, the less re-work one has to do would lead to lower costs and thus producing a quality
product efficiently must be the goal. But can this goal keep the plant working? Alex
considers a few examples of companies that were producing low cost quality products but
have now discontinued them such a Volkswagen’s Bugs etc. and so he comes to the
conclusion that turning out a quality product on an efficient basis is not the goal.
TECHNOLOGY
If one has to stay in the business, he has to have the leading edge of technology. But then if
technology is the goal of a manufacturing organization, then how come the most responsible
positions aren’t in research and development. How come R & D is always off to the side in
every organization chart and even if the plant did have the latest technology would it save the
plant. No it wouldn’t and so even though technology is important it isn’t the goal
SALES & MARKET SHARE
Alex then thinks about all the 20 million dollars worth of finished goods inventory in his
inventory, which they haven’t been able to unload yet. Quality products, all produced
efficiently with the most current technology are all piled up in the warehouse waiting for
someone to buy them. So is sales and market share the goal? But Alex remembers the old
line “we are losing money, but we` re going to make it up by volume”. A company will
sometimes sell at a loss or at a marginal profit just to unload inventories. Thus one can have a
big market share, but what is the use is you are losing money in maintaining your share.
MONEY
Then Alex realises that Bill is going to shut Alex`s plant down because his plant is losing
money and the only way he can save his plant is by doing some incredibly brilliant thing and
stemming the losses so as to make profits and through that money. Thus the goal of a
manufacturing organization is to make money. If a company doesn’t make money by
producing and selling products, the company is finished. It will cease to function.
12
Thus if the goal is to make money, then putting it in Jonah`s terms:
An action which moves towards making money is productive and an action that takes away
from making money is non productive.
Alex realizes that in the past one year his plant is moving away from the goal rather than
more towards it. So in order to save the plant, Alex has to make it productive, i.e. he has to
make money for UniCo.
MEASUREMENTS FOR OBTAINING THE GOAL?
We have seen that, making money is the goal of an organization. However in order to know
if one is actually achieving the goal, there is a need for certain measurements against which
the goal can be measured. The author here gives us a set of measurements against which one
can measure the extent to which one has succeeded in achieving the goal.
NET PROFIT (NP):
NP is an absolute measurement. Indeed it would tell us how much excess of income we have
made over expenses. But NP can be sometimes misleading on its own. For example, lets say
we earn a profit of $10 million. On an absolute basis this is a wonderful figure and sounds
like a lot of money, but is it enough when compared to amount of money we invested? If we
started with a million dollars then we have made 10 times more money than we invested and
that’s excellent, but if we have invested a billion dollar then a profit of 10 million dollar
seems pretty lousy. Hence an absolute measurement has to be compared with some other
relative measurement to draw some meaningful interpretation from it
RETURN ON INVESTMENT (ROI)
ROI is a relative measurement, to compare the money made relative to the money invested.
This would solve the above problem, however there are examples of companies having a
good ROI but still going bankrupt. And the basic reason behind this is inadequate or
improper cash management. Bad Cash Management can drive a perfectly healthy company
on the verge of bankruptcy.
13
CASH FLOW ANALYSIS
To support the above two measurements, Cash flow analysis is essential as it tells an
organization how much funds are available to it in liquid cash, what are the requirements for
cash during a given period and what are the sources from where funds are going to flow into
the Company. Cash flow analysis is essential because it is a measure of survival. Stay above
the liquidity margin and an organization is OK and go below it and the organization is dead.
WHAT IS THE GOAL?
Finally Alex after much deliberation with Lou his plant controller defines the Goal as:
“TO MAKE MONEY BY INCREASING NET PROFIT, WHILE SIMULTANEOUSLY
INCREASING RETURN ON INVESTMENT AND INCREASING THE CASH FLOW.”
14
10. CHAPTER VIII10. CHAPTER VIII
THE REFINED GOAL
The measurements that Alex decided to measure the goal are more of accountant’s
measurements and as such they may not be applicable down at the plant level and may not
really tell whether or not the plant is really productive.
To make the measurements more compatible with the scenario on the plant floor the author
gives us 3 different measurements. The goal essentially remains the same; only it is stated in
a different and more compatible manner. The definitions may sound simple but they are
worded very precisely differently than the conventional definitions. The measurements are:
THROUGHPUT
It is the rate at which the system generates money through sales. Normally throughput is
associated with production, however the author rightly argues that even if we produce
something, but are not able to sell it, its doesn’t give any money to the Company and
consequently it is not throughput.
INVENTORY
It is all the money that the system has invested in purchasing things which it intends to
sell.
OPERATIONAL EXPENSE
It is all the money the system spends in order to turn inventory into throughput.
Each of the definitions given by the author contains the word “money”. Throughput is the
money coming in. Inventory is the money currently in the system and operational expense
is the money one has to pay out to make the throughput happen.
One measurement for the incoming money, one for the money still stuck inside and one for
the money going out. The reason why the author decided to define inventory and operational
expense in the above fashion was because he didn’t want to take into account any value
15
added as it eliminates the confusion over whether a dollar spent is an investment or an
expense. For example normally direct labour cost is added to the inventory cost, however the
author has decided to treat it as an operational expense because the time of the employees
isn’t what the plant is selling. The plant buys the time from the employees. Thus all
employee time whether direct or indirect, idle or operating time is operational expense and
still getting accounted for in a simpler way.
Alex tries to correlate the above definitions with his earlier conversation with Jonah
regarding the Robots. Alex realizes that Jonah was using the measurements in a crude form
of simple questions to check whether the robots had really increased productivity.
Jonah`s Basic Questions Questions in terms of measurements
Was his plant able to ship even one more product
per day?
Did the throughput go up or increase?
Did he lay off any people and reduce people’s
expenses?
Did the operational expense go down?
Did the inventories of the plant go down? Did the inventories go down?
So the way to express the goal is:
INCREASE THROUGHPUT WHILE SIMULTANEOUSLY REDUCING BOTH
INVENTORY AND OPERATING EXPENSE.
Which means that if the robots have made the throughput go up and the other two factors to
go down, they have made money for the system.
16
11. CHAPTER IX11. CHAPTER IX
THE DISCUSSION ON ROBOTS
With goal clearly defined Alex decides to find out if the robots had actually increased the
productivity. He studied the impact of the installing of the robots on the 3 measurements
given by Jonah. Alex with his team (Lou, Stacey, Bob and Ralph) discovered that in every
case where a robot came on line, there had been no increase in sales for any product for
which they made parts. The only increase was in the list of overdue shipments.
The work in progress on the parts produced by the robots had also gone up on those parts
since they were installed. Stacey associated the reason of increase in inventories to release of
more materials to the plant floor to keep the robots working so as to increase their utilization
rate. As a result though the efficiencies of the robots did go up, the plant was also ending up
with huge surpluses of inventories. Further the plant wasn’t consuming those inventories, as
it didn’t have any orders that would call for those parts.
Stacey pointed out the irony that in cases where the plant did have orders, it just didn’t seem
to get enough of the parts required. The reason for the above shortage in required parts was
that whenever the utilization rate of the robots falls, everybody drew materials from the
stores against the future forecast to keep the robots busy. And hence the robots had been
producing parts for which there were no orders resulting in an increase in inventories.
Unfortunately the forecast didn’t hold up resulting in surplus inventory.
Thus it could be seen that in order to give more to the robots to do, more materials were
released, which in turn increased inventories and in turn the costs of the plant. Alex
concluded that they had been managing a very inefficient plant and not according to the Goal
and went on to explain his meeting with Jonah to his team.
17
12. CHAPTER XI12. CHAPTER XI
EFFICIENCY – GOOD OR BAD!!!!
Through years we have all come to believe that idle time is not desirable irrespective of
whether it is normal or abnormal. Most managers are also in a constant struggle to eliminate
as much of idle time as possible because we believe that idle time is bad for the company
since it was a waste of money since the company doesn’t pay its employees to be idle. In this
chapter the author had taken a stand that idle time is in fact desirable and essential for the
proper functioning of an organization. In fact he believes that “A PLANT IN WHICH
EVERYONE IS WORKING ALL THE TIME IS VERY INEFFICIENT”
The author adds that that Alex’s plant is the best example of the above statement. The
struggle to keep the robots and the workers busy had resulted in a huge pile of inventories for
which there was no demand. Most of the managers today believe that their plant are so short
of people that the only way they can get products out of the plant is by keeping everyone
working. However the author says that the only way one can have huge excessive inventories
as in case of Alex is by having excessive manpower or by over working people. Machines
don’t set up and run themselves. People are the ones who create inventory. The author
vehemently advices the readers to stop focusing on efficiencies and instead concentrate on
making money, which is the true goal.
Alex tells Jonah about their finding on the robots and admits that their excessive focus on
increasing efficiencies of the robots had resulted in a movement away from the goal.
THE BALANCED PLANT – A MYTH
Here the author has introduced the concept of a balanced plant, to explain the validity of his
above statements. The author defines a balanced plant as:
A plant where the capacity of each and every resource is balanced exactly with the demand
from the market.
Every manager tries to achieve this because if they don’t have enough capacity, they are
depriving themselves out of potential throughput and if they have more capacity they are
wasting money and missing an opportunity to reduce operational expense. The tendency for
18
most managers to achieve this is to trim the capacity wherever they can, so no resource is idle
and everybody has something to work on.
However according to the author nobody ever runs a perfectly balanced plant because the
closer one gets to achieve a balanced plant, the closer he gets to bankruptcy.
This is because the obsession with trimming capacity leads to laying off of people, which
only results in a decrease in operational expenses without a decrease in inventory or increase
in sales. Besides in trimming capacity to balance with market demand managers make a
universal assumption that it wont affect throughput or inventory. Contrary to the assumption
there is a mathematical proof that when capacity is trimmed exactly to marketing demands,
no more and no less, throughput goes down and inventories go through the roof, and because
inventories increase, the carrying cost also increases which is nothing but an operational
expense. And so the one measurement, which is expected to improve by layoff of people,
also increases taking one away from the goal.
The reason for the above result lies in a combination of two phenomenons that are found in
every plant. They are:
DEPENDENT EVENTS
It is an event or a serious of events, which must take place before another can begin. The
subsequent event depends upon the ones prior to it
STATISTICAL FLUCTUATIONS
There are some kinds of information that we cannot precisely predict. Like how long it will
take a waiter to bring a check after every meal or the number of eggs that would be in the
fridge on any given day. These types of information vary from one instance to the next i.e.
they are subject to statistical fluctuations.
In context with the story in the book, Alex however feels that in case of a worker doing the
same job day in and day out, these fluctuations would average out over a period of time.
Jonah however disagrees with him and asks Alex to reflect on these definitions in
combination and no singularly.
19
13. CHAPTERS XIII & IV13. CHAPTERS XIII & IV
THE HIKE
Chapters XIII & IV are the most crucial and one of my favourite chapters of the book. In
these chapters the author has explained the meaning and practical application of all the
technical terms that he has defined till now. Reading these two chapters makes ones concept
really clear and gives a whole new perspective about the book.
The chapters describe how Alex understood the combined application of the dependent
events and statistical fluctuations on a hike which he went to along with his son.
Alex went on a hike as a troop master with his son Dave. The plan for the troop was to hike
through the forest following a blazed trail to someplace called “Devil’s Gulch”. The distance
from the starting point to Devil’s Gulch was 10 miles and the troop had to cover this distance
in a period of 5 hours i.e. at a rate of 2 mils per hour. They started off with Ron who was the
fastest in the lead, followed by the other boys with Herbie who was the fattest and the
slowest at the end. After sometime time Alex noticed that the column of scouts had spread
out to some degree. A couple of gaps had appeared between the columns and he could barely
see the kids at the end of the line.
THE COLUMN OF TROOPS WITH RON IN THE LEAD
Alex commanded Ron to halt until everybody came together. However after sometime the
gaps again started appearing. Looking at the spread out column, Al ex started correlating
20
DEVIL GULCH
START
RON
DAVE
HERBIE
RON
DAVE
HERBIE
RON
DAVE
HERBIE
AFTER 30 MINS
AFTER 90 MINS
what was happening with his conversation with Jonah on dependent event and statistical
fluctuations. It was then that he understood the combined effect of the two phenomenons.
Ron who was the fastest was setting the pace. Every time someone moved slower than Ron,
the line lengthened. If one of the boys took a step that was an inch shorter than the one Ron
took, the length of the whole column increased.
Alex then remembered his earlier argument that the statistical fluctuations were bound to
average out over a period of time. So Alex thought that when someone moved faster than
Ron it would make up for the spreading, averaging out the fluctuations.
However Alex realised that even if he were to walk faster, he could close the gap only
between himself and the kid in front of him. Once the gap was closed he couldn’t go any
faster than the rate at which the kid in front of him was going. And the kid in turn couldn’t go
faster than the kid in front of him and so on up the line to Ron. Which meant that except Ron
each of their speeds depended upon the speed of those in front of them in the line.
Thus the hike was like a set of dependent events, in combinations with statistical fluctuations
in the form of speed of each person. The ability to go faster than the average speed was
restricted by the person in front. So everyone had got limits on how fast he could go. A boy
could go only so fast as those in front of him, but conversely there was no limit on a person’s
ability to slow down or stop. And if anyone slowed or stop the line would extend indefinitely.
Thus what was happening wasn’t an averaging out of the fluctuations in the various speeds
but an accumulation of the fluctuations. And mostly it was an accumulation of the slowness
and that is why the line was spreading.
ANALOGY TO THE PLANT
The author has established a beautiful analogy between the hike and the plant. Even in the
plant there are both dependent event and statistical fluctuations. The troops of boys were
analogous to a manufacturing system, and the troop produced a product in the form of a walk
trial. Ron began production by consuming the unwalked trail before him, which was
equivalent to raw material. So Ron processed the trial first by walking over it, then the other
boys behind him till Herbie who was last. Each of the boys was like an operation that had to
be performed to produce the product in the plant. Only after the last boy i.e. Herbie had
21
walked the trial was the product sold, and thus the throughput would be the rate at which
Herbie walked the trail and not Ron.
The amount of trail between Ron and Herbie would be the inventory and the energy spend by
each kid would be the operational expense. If the distance between Ron and Herbie
increased, it would mean the inventory was increasing. Because Herbie was slowed down by
the fluctuating rates of others, so that the slower than average fluctuations accumulated, the
effect would work back to Herbie. Which meant that inventory grew and the throughput of
the entire system went down.
If inventory went up, so would the carrying cost on inventory that is an operational expense.
In terms of the hike, the operational expense was increasing every time the boys hurried to
catch up, because they spent more energy.
Thus inventory was going up, throughput was going down and operational expense was also
increasing in the hike and which was what was precisely happening to Alex’s plant.
22
14. CHAPTER V14. CHAPTER V
THE SOLUTION
The hike and the column of students made Alex realise the problem that he was facing in his
plant. Now he needed to come out with some solution in order to keep the column of students
together.
Alex realised that the boy who would be moving the slowest at any given moment of time
would determine the throughput of the entire system. That person may be any boy who took
a step shorter or walked slower than Ron. Thus the boy slowing the troop down may not
always be Herbie, but overall, Herbie had the least capacity for walking and so his rate
ultimately was bound to determine the troops rate. Having come to a conclusion that Herbie
was the limiting factor, Alex tried to devise a way to make Herbie go faster and also the keep
the boys together in a single line.
First he removed all the excessive weight from Herbie`s backpack and distributed it between
himself and the other boys. Then he asked all the boys to stop and made them stand in a line
in the position they were currently walking. He made everyone join hands and taking
Herbie`s hand who was standing last, he reversed the whole column of troops, such that
Herbie was now in the lead, followed the other slower guys and the faster boys like Ron were
at the end of the column.
The result of the above two actions was dramatic, Herbie because of the weight on this back,
reduced could now really walk faster and because nobody was allowed to overtake anybody
the column remained compact as the faster boys at the end easily kept up with the slower
boys in the front.
The column of troops was now flying, doing twice the speed they were doing before and they
still managed to stay together. In the author’s language, inventory went down and throughput
increased.
23
THE COLUMN OF TROOPS WITH HERBIE IN THE LEAD
24
DEVIL GULCH
RON DAVE HERBIE
RONDAVEHERBIE
AFTER 120 MINS
AFTER 240 MINS
AFTER 180 MINS
RONDAVEHERBIE
RONDAVEHERBIEAFTER 300 MINS
15. CHAPTER XVII15. CHAPTER XVII
THE PROOF
In this chapter, the author proves the analogy that he had established between the plant and
the hike. When Alex observed that his team was not entirely convinced with his conclusions
from the hike he decided to prove it by taking an actual example from the plant floor. He
selected a Do It Now category job where a particular product had to pass through two
processes i.e. one manual and the other on the robots before it could be shipped. There were
in all 100 units to be processed within 5 hours i.e. at the rate of 25 units to be processed per
hour by each department.
The manual department was supposed to produce at the rate of 25 units per hour. But that
doesn’t mean they would always have 25 units at the end of every hour. Sometimes they
would have a few pieces short and sometimes they will be a few pieces ahead. Thus the
process involved statistical fluctuations. The robot on the other hand was supposed to be
precise in its output. It would be setup for 25 units per hour- no more no less. Thus the
process was a dependent event i.e. the robots depended upon the manual department to
supply them with 25 units per hour in order to begin processing. The planning was that from
12 noon until 4 pm, the manual department would produce 100 units per unit at the rate of 25
units per hour. From 1 pm onwards the robots would begin processing on the first batch of
units send by the manual department thus finishing the job by 5 p.m.
EXPECTED SCHEDULE -
Demand = 100 units, Quota = 25 units per hour [ ] – indicates cumulative production.
12.00 – 1.00 1 .00 – 2.00 2.00 – 3.00 3.00 – 4.00 4.00 – 5.00 5 pm
Manual
Dept.
25
[0]
25
[25]
25
[50]
25
[75]
------------
[100]
-------
Robot -------- 25
[0]
25
[25]
25
[50]
25
[75]
-------
[100]
ACTUAL PRODUCTION SHEET AT 5 PM –
Demand = 100 units, Quota = 25 units per hour
25
[ ] – Indicates cumulative production.
( ) – Indicates cumulative shortfall in production as per target
12.00 – 1.00 1 .00 – 2.00 2.00 – 3.00 3.00 – 4.00 4.00 – 5.00 5 pm
Manual
Dept.
19
[0] (0)
21
[19] (-6)
28
[40] (-10)
32
[68] (-7)
------------
[100] (0)
-------
Robot -------- 19
[0] (0)
21
[19] (-6)
25
[40] (-10)
25
[65] (-10)
-------[90]
(-10)
From the above production sheet we can see that in the first hour, the manual department
processed only 19 units. The robots were capable of doing 25 units, but since the manual
department could deliver only 19 units, the true capacity of the robots became 19 units for
that hour. Same with the second hour, the manual department could deliver only 21 and so
the robots could process only 21 units. Thus every time the manual department lagged behind
target, the effect was passed on to the robots.
However when the manual department delivered 28 units, the robots could process still
process only 25 units, which meant that when the final delivery of the 32 units arrived at 4
pm, the robot still had 3 units to work on from the last batch, so it couldn’t start on the batch
right away. Similarly at 5 pm, the robots still had to process 10 units, which was exactly the
number of units, the manual department ever got behind the schedule.
Thus Alex proved the mathematical principle that the maximum deviation of a preceding
operation would become the starting point of a subsequent operation.
26
16. CHAPTER XVIII16. CHAPTER XVIII
BOTTLENECKS
The author has so far proved that one cannot measure the capacity of a resource in isolation.
Its true productive capacity depended upon where its position was in the plant. In order to
know the position and the importance of a particular resource in an organization, the author,
has classified all resources into 2 categories as follows:
BOTTLENECK RESOURCE:
It is any resource whose capacity is equal to or less than the demand placed upon it.
NON-BOTTLENECK RESOURCE:
A resource, which is not a bottleneck resource, is a non-bottleneck resource.
Having seen the actual demonstration of the effect of dependent events and statistical
fluctuations on the production system, Alex and his staff come to the conclusion that they
had to change the way they thought about production capacity. Jonah advices them not to
balance the plant capacity not according to the market demand, but to balance the flow of the
product through the plant with the demand from the market. Thus the author here gives amn
important rule:
“BALANCE FLOW and NOT CAPACITY”
The idea is to make the flow through the bottleneck equal to demand from the market.
HERBIE’S AT THE PLANT
With the above advice from Jonah, Alex and his team set out to identify the bottlenecks or
Herbie as they decided to call them in the plant. Since they were short of time and the data
available was inadequate and inaccurate, they decided to the identify the bottlenecks using
the help of the expeditors as they would be able to tell them which parts are missing or are in
short supply most of the time and which departments are responsible for the supply of the
parts. The departments where the parts were to come from would invariably posses the
Herbie in the plant. Also just as on the hike one could identify the slower boys by the gaps in
the line and greater the gap, greater would be the inventory, in case of the plant a Herbie
would have a huge pile of work in progress sitting in front of it.
Using the above methodology, Alex and his team identifies the first bottleneck as:
27
BOTTLE NECK # 1: NCX – 10 MACHINE
The reasons why NCX – 10 was classified as a bottleneck was:
The machine had stacks of work in progress inventory in front of it dating back to a
couple of weeks,
The expeditors also confirmed that they were always waiting for parts from this machine,
The machine was installed 2 years earlier to replace 3 different machines, thus reducing
processing time from 14 minutes to 10 minutes, however, earlier there were 3 sets of the
machines whereas the NCX –10 was the only one of its kind. Which meant that though
the processing time reduced, there was no increase in the number of units being
processed annually and,
The employee turnover on the machine was very high as it was in demand in the market
and it took six months to train a new person to operate the machine.
BOTTLE # 2: HEAT – TREATMENT DEPARTMENT
The reasons why HEAT – TREATMENT department was classified as a bottleneck was:
The parts put in the furnace had to remain in it anywhere from 6 hours to 16 hours.
Afterwards, the parts had to go through a cool down to air temperature process outside
the furnace. Thus a lot of time was lost in this process.
The furnaces never operated at full capacity because the batch sizes were either too small
to fill up the furnace capacity and sometimes the batch size was too big, that 2 runs were
required.
Thus Alex and his team had discovered two bottlenecks in their plant. They were holding
everything up and as a result there were piles and piles of inventory stacked up in front of
them. And unlike the boys on the hike, they couldn’t be rearranged at the start of the
operations and were stuck in the middle of the line.
28
17. CHAPTER XIX17. CHAPTER XIX
COST OF A BOTTLENECK
According to the author the main problem in case of bottlenecks was that they were not
maintaining a flow sufficient to meet demand and to make money and so the only solution to
the problem was to find ways to increase their inherent capacity. The essence of the problem
lied in finding enough capacity for the bottlenecks to become more or equal to the market
demand. In most organizations, the bottlenecks always have some hidden capacity because of
the wrong thinking of the managers.
Jonah visited the bottlenecks one by one and discovered a couple of issues regarding the
bottlenecks such as:
The machines were idle.
Bottlenecks were producing units for which there was no immediate demand
The bottlenecks were processing units which were faulty, thus wasting precious time of
scrap
There was no optimum utilization of the limited number of hours available on the
bottlenecks.
Jonah then went on to explain Alex and his team the importance of the bottlenecks and how
precious were the hours available on them. He explained them that every time a bottleneck
finished a part, if facilitated the shipment of a product, which meant an average of a 1000
dollars in sales per unit.
The author here states that calculating the per hour cost of a bottleneck in isolation of the
whole production system was a flaw which most people committed. According to him the
cost of operating the bottlenecks should be calculated taking into consideration the fact that
the capacity of the plant is equal to the capacity of the bottleneck. Thus whatever the
bottlenecks would produce in an hour is equivalent of what the plant produces in an hour, so
an hour lost at a bottleneck was an hour lost for the entire system. And hence the cost per
hour of a bottleneck would be the cost for the entire plant to be idle for one hour.
The cost in case of Alex’s plant could be calculated by dividing the total operating expenses
for a month by the number of hours the bottleneck produced. Which in their case worked out
29
to be $ 2735 per hour as against $ 21 per hour if the cost of the bottleneck is calculated in
isolation.
OPTIMISATION OF BOTTLENECKS
Jonah identified 3 ways in which Alex could optimize the use of bottlenecks.
1. Ensure that time on the bottlenecks was not wasted. The different ways in which time
could be wasted are:
By keeping it idle during lunch breaks
Processing parts which were already defective
Wasting a bottlenecks time on parts, which were not needed immediately for sale.
2. Making the bottlenecks work only on what would contribute to the throughput today and
not in the future.
3. Increase bottleneck capacity by taking off some load and giving it to non-bottlenecks.
30
18. CHAPTER XX – XXIV18. CHAPTER XX – XXIV
CORRECTIVE STEPS
Alex and his team took the following corrective actions after Jonah`s visit to their plant and
its comments on the utilization of the bottlenecks
1. QC BEFORE BOTTLENECKS
Moved the Quality Control inspection points before the bottlenecks in order to inspect the
parts before they could be processed by the bottlenecks. This eliminated about 5 to 7 % of the
parts, which were defective from being processed by the bottleneck, thus gaining additional
throughput.
2. NEGOTIATIONS WITH THE UNION
Negotiated with the union to eliminate bottleneck idle time by asking the workers working on
the bottlenecks to take their breaks only during the hours when the bottlenecks were
operating or busy.
3. NEW PRIORITY SYSTEM
Introduced a new priority system for processing orders. Under this system, all the work in
progress was marked by a tag with a number on it. The tags were of two colours – red and
green. A red tag indicated the work attached to it had first priority and would be put on
materials that required processing on the bottlenecks. When a batch with a red tag arrived the
worker was supposed to start work on it with half an hour after completing the job on hand.
In case of 2 batches with the same colour, the number on the tag had to referred and the
materials with the lowest number had to be worked upon.
4. CHANGE IN CONTROL PROCESSES POST QC
Since QC was installed before the bottlenecks, it was necessary that the parts coming out the
bottlenecks had to be handled with great care in order to avoid any damages. So a system of
yellow tags was introduced. Under this system a yellow tag on the materials indicated it had
31
been processed by the bottlenecks and so the parts had to handled with great care and
caution.
5. ACQUIRE SUBSTITURE MACHINERY
Bob managed to acquire free of cost the machines which the NCX –10 had replaced. The
machines were put into operations and as a result the capacity of the plant increased by those
many number of units.
6. ASSIGNED DEDICATED SETUP CREW
Assigned a dedicated setup crew to the bottlenecks so that, they would be always attended to
and new batches would be loaded immediately once the previous batch was finished being
processed. This further eliminated any idle time on the bottlenecks caused due to non-
attendance of people at the machines when processing stopped.
7. STANDARD OPERATING PROCEDURES FOR HEAT TREATMENT
Formulated standard operating procedures in case of bottlenecks such as filling up the
furnace to its optimum capacity using different parts if the batch of any one order is too small
or big to fill up the furnace.
8. INCENTIVE & REWARDS
Visited the crew at the bottlenecks frequently so as to motivate them and to make them feel
important and also suggested that rewards would be given to anyone who could improve the
output at he bottlenecks.
9. CHANGE IN MFG PROCESS FOR CERTAIN PARTS
Eliminated heat treatment process in case of all those parts in whose case it was not specified
or required by the engineering department, but the management was doing it a part of normal
routine.
32
THE RESULT
A result of all the above improvement steps that Alex and his team took was that, that were
able to set up a new plant record. They were able to ship 57 orders amounting to 3 million
dollars. The work in progress declined by 12 percent and delays had reduced to 15 days from
58 days.
33
19. CHAPTER XV & XVI19. CHAPTER XV & XVI
NEW BOTTLENECKS?
After the initial euphoria of the success of the above factors, Alex and his team suddenly
discovered that shortage of parts was now felt from some of the non bottleneck resources and
also piles and piles of inventory were getting accumulated at the assembly shop and the stock
in front of the bottlenecks started increasing again. Alex thought that perhaps with the
increase in the throughput, they must have loaded the plant to such a level that they must
have run out of capacity on some other resource in addition to those identified earlier.
Making the bottlenecks more productive must have put more demand on other non-
bottleneck work centres. If the demand on the other work centres had gone above 100
percent, then it must have resulted in the creation of a new bottleneck.
At this juncture the author reminds us of one of his earlier statement “A plant in which
everyone is working all the time is very inefficient”; which is what was precisely happening
in Alex’s plant.
The author then goes on to explain some basic relationships between bottlenecks and non-
bottlenecks with the help of 3 diagrams:
DIAGRAM I
He denotes a bottleneck by the alphabet ‘X’ and a non-bottleneck by the alphabet by ‘Y’. In
the above diagram machine Y is feeding parts to bottleneck X. By definition a non-
bottleneck has extra capacity and so Y will be faster in filling demand than X. Both X & Y
would have the same capacity in term of hours per month (say 600 hours). Since X is a
bottleneck, the plant will need all the 600 hours of X to meet the demand. But the plant may
need only 450 hours of Y to equal the demand. In this case Y would be left with a surplus
capacity of 150 hours. If the plant released more materials to keep Y busy, then the parts,
which Y produced in those 150 hours, were bound to get stuck as work in progress inventory
34
Y ---- X
in front of the bottleneck as all the 600 hours of X were already being utilized. Thus pushing
more material than the system can convert into throughput was resulting in excess inventory.
DIAGRAM II
Similarly in a situation where X is feeding Y, only 450 hours of the total capacity of Y can be
used productively. If Y is exclusively depending upon X to feed it with inventory, the
maximum number of hours it can work is determined by the output of X. Thus after working
for 450 hours Y will be starved for inventory, which is quite acceptable.
DIAGRAM III
In this case there are 2 routes. In one route, Y feeds parts directly to the Assembly shop,
which is also a non-bottleneck. On the second route, parts reach the assembly shop after they
have being processed by X. In case both X and Y are kept working continuously for every
available hour, excess inventory from Y will reach the Assembly shop and get piled up there
because 80 percent of the products would require at least one part from X, resulting in piles
of inventory getting accumulated in front of the assembly shop converting it into a
bottleneck.
From the above linear combinations we observe that in no case does Y ever determine the
throughput for the system. Whenever Y is operated at a level above X it results only in
excess of inventory and not throughput.
Thus the author gives us a very simple rule:
“THE LEVEL OF UTILISATION OF A NON BOTTLENECK IS NOT DETERMINED
BY ITS OWN POTENTIAL, BUT BY SOME OTHER CONSTRAINT IN THE SYSTEM.”
35
X ---- Y
Y ---- X ----
ASSEMBLY
In context with Alex’s plant, a major constraint was the NCX – 10 machine. When a non-
bottleneck did more work than the NCX – 10, it did not increase productivity, but did exactly
the opposite i.e. created excess inventory, which was against the goal.
Alex like most other managers was working under the fundamental wrong assumption that,
“ONE MUST MAKE THE WORKERS PRODUCE ONE HUNDRED PERCENT OF
THE TIME, OR ELSE GET RID OF THEM TO ‘SAVE’ MONEY.”
The author here makes a very interesting point that making an employee work and profiting
from that work are two different things. Similarly activating a resource and utilizing a
resource are not synonymous.
“Utilising a resource means making use of the resources in a way that moves the system
toward the goal.”
“ Activating a resource is like pressing a ON switch of a machine, so that it would run
whether or not there is any benefit to be derived from the work its doing.”
Thus really speaking activating a non-bottleneck to its maximum is an act of maximum
stupidity.
The implication of these rules is that we must not seek to optimise every resource in the
system. A system of local optimums is not an optimum system at all, it is a very inefficient
system.
THE DIAGNOSIS
Alex and his team realised that they were releasing materials faster than the bottlenecks could
process them. What happened was that even as throughput increased, they continued loading
the plant with inventory just to keep their workers busy. This increased the load dumped on
the milling machines (non-bottlenecks) and pushed them beyond their capacity. The priority
red tags were processed and the green tags kept piling up. So not only did they create more
inventory at the NCX – 10 machine and the Heat Treatment department, but due to the
volume of the bottleneck parts, they also clogged the flow of another work centre and
prevented non bottleneck parts from reaching the assembly shop, and in the process creating
a new bottleneck.
36
They decided to withhold the materials for the red parts instead of pushing them out as soon
as the first bottleneck had nothing to do. The milling machines would then have time to work
on the green parts and the parts, which were missing, would reach the assembly on time.
Thus they had to find the way to release the material for the red parts according to the rate at
which the bottlenecks needed material. They needed some kind of signal to link the
bottlenecks with the release of material schedule. They also made a system so as to predict
when to release material based on the data kept of the bottlenecks. The system could predict
several weeks in advance what each bottleneck would be working on at a particular time.
Based on what was in the queue and the average setup time along with the process times for
each type of part the system could predict the requirement of materials to about plus/minus a
day or two. This allowed them to keep a three-day stock of work in progress in front of each
bottleneck. They also developed a system to attack the inventory problems in front of the
assembly. Using a schedule for releasing red tag materials based on the bottlenecks the
system could also determine a schedule for the final assembly. Once the data regarding when
the bottleneck parts would reach the final assembly was available the system could calculate
backwards and determine the release of the non-bottleneck materials along each of their
routes. In this way the bottlenecks determined the release of all the materials in the plant.
Alex concluded by saying that its going to produce the same effect as moving the bottlenecks
to the head of production which is what he had intended to do.
37
20. CHAPTER XXVII - XXIX20. CHAPTER XXVII - XXIX
THE NEW CHALLENGE
In these chapters the author has shown how to make the optimum utilization of the idle time
available on the non-bottlenecks, which was available due to scheduling as per the capacity
of the bottlenecks.
Alex approached Bill after three months and told him about the improvements in his plant.
He also informed Bill that there was no need now to shutdown the plant. However Bill said
that he was not convinced that the improvement was just a flash in the pan and he would
consider Alex’s statement if he showed a bigger improvement of 15% or more on the bottom
line than the previous month.
BATCH SIZE MIRACLE
Jonah adviced Alex and his team to cut the batch sizes of the parts in half on non-bottlenecks.
A cut in the batch sizes meant that at any one time they would have half the work in progress
on the plant floor. Thus they would need only half the investment in work and progress to
keep the plant running. By negotiating with the vendors they could cut all the inventories in
half and reduce the amount of cash tied up any one time, which would ease the pressure on
the cash flow and thereby pushing up the profits.
According to the author the total time from the moment the material comes into a plant to the
minute it goes out as finished product could be divided into four elements as follows:
1. SETUP TIME – It is the time the part spends waiting for a resource while the resource is
preparing itself to work on the part.
2. PROCESS TIME – It is the amount of time the part spends being modified into a new
and more valuable form.
3. QUEUE TIME – It is the time the part sends in line for a resource while the resource is
busy working on something else ahead of it.
4. WAIT TIME – It is the time the part waits not for a resource but for another part so they
can be assembled together.
Setup and process times are a small portion of the total elapsed time for any part. But queue
and wait time often consumes large amount of time that the parts spend inside the plant. For
parts going through bottlenecks queue is the dominant portion whereas in case if a non-
38
bottleneck wait is the dominant time because they are waiting in front of assembly for parts
that are coming from there bottle necks. This means that in each case the bottlenecks are
what dictate the total elapsed time. And hence the bottlenecks also dictated inventory as well
as throughput.
A reduction in batch sizes by half would also reduce by half the process time of a batch,
which in turn reduced the queue, and wait time by half as well. This would reduce the total
time spent by the part in the plant and condense the total lead-time. This would result in
faster turnaround on orders and with customers getting a faster response it would serve as an
advantage in the market place ultimately increasing the sales of the parts.
Here it is very normal for a person to assume that due to the reduction of batch sizes in half it
would proportionally increase the set up times and thereby increasing the cost per part.
However the author lays to rest any such fears reminding us that just as an hour lost at a
bottleneck is an hour lost for the entire system, likewise
“An hour saved at a non-bottleneck is a mirage.”
According to the author when we start withholding materials from the plant floor until the
bottlenecks are ready for them, the non-bottlenecks would then have idle time.
Hence it was perfectly okay to have more set ups or non-bottlenecks; because all the extra
setups would consume only the idle time that is inherently available on the non-bottleneck.
Thus saving setups at a non-bottleneck didn’t make the system one bit more productive. The
time and money saved is an illusion.
In case of Alex even if they were to double the number of setups it wouldn’t consume all the
idle time. Jonah further advises Alex to approach the marketing department and convince
them to conduct a new campaign, which would promise customers delivery within six weeks.
This would clearly be a market winning strategy and profits were bound to increase.
21. CHAPTER XXX 21. CHAPTER XXX
THE VICTORY
The results of the above improvements and strategies adopted by Alex and his team were:
39
Inventory levels had fallen and were continuing to fall rapidly.
By withholding materials they were no longer choking on work in progress.
Parts were reaching the bottlenecks when they were supposed to and the flow through the
plant was much smoother that before.
Rate of shipments grew dramatically and efficiencies were on a high.
The best news was that they had completely wiped out their backlog of overdue orders
and had caught up with orders on hand.
Throughput was up.
The plant got plenty of new orders and increased customer loyalty.
The work force was now more occupied productively than before.
The stacks and piles of parts and subassemblies had shrunk to half their former size.
They had shipped the excess inventory as finished product.
The most notable part was that, they hadn’t filled the plant again by dumping new work
in progress on the plant floor. The only work in progress on the plant floor was for the
current demand.
The improvements also helped Alex in regaining orders from Bucky Burnside, their
biggest and most prestigious customer.
The plant recorded a remarkable increase of 21% in the bottom line consistently for a
period of three months.
Finally at end of five months Alex and his team’s efforts were rewarded. Alex was
promoted to Bill’s position at the group level.
40
22. CHAPTER XXXI – XXXX22. CHAPTER XXXI – XXXX
THE SOCRATIC APPROACH
A reading of the book makes us realise that the solutions that Jonah caused Alex and his team
to develop had one thing in common. They all made common sense and at the same time they
went against everything Alex and his team had ever learnt. They wouldn’t have had the
courage to implement them, if it weren’t for the fact that they had to sweat to construct them.
If it weren’t for the conviction and the ownership that they developed during the process,
they wouldn’t have had the guts to put the solutions into practice.
The author says we refer to something as common sense only if it is in line with our own
intuition; i.e. at least intuitively we know it all along.
Then why is there so often the need for an external trigger to help us realise something that
we know intuitively?
According to the author these intuitive conclusions are probably masked by something else
that is not common sense, but thick layers of common practice. Jonah’s way of leading to the
answers through asking questions i.e. his Socratic approach was very effective at peeling
away the thick layers of common practice. Spelling out answers when one is trying to
convince someone who blindly follows such common practices is totally ineffective. It is
amazing how deeply ingrained are things that we have been told and practiced, but never
spent the time to think about on our own.
Thus, the essence of Jonah’s teaching was to persuade other people to peel away the layers of
common practice and overcome their resistance to change.
41
The author gives us a five-step procedure to overcome any problems that we might face.
Step1: IDENTIFY the systems constraint(s).
Step2: Decide how to EXPLOIT the systems constraint(s).
Step3: SUBORDINATE everything else to the above decision.
Step4: ELEVATE the system’s constraint(s).
Step5: WARNING!!!! If in the previous steps a constraint has been broken, go back to
step1, but do not allow INTERTIA to cause a system’s constraint.
‘THE GOAL’ – VALUE TO A MANAGEMENT STUDENT
The book explains how to see businesses as systems as well as any other book on this
subject.
The metaphor of how to speed up a slow-moving group of boy scouts will be visceral to
anyone who has done any hiking with a group.
The book helps us learn how to improve the performance of a system by providing us
with a replicable process that we can apply to analysing any human or engineering
system.
We get to experience the power of the Socratic method as a way to stimulate our mind to
learn, and to use Socratic questions to stimulate the minds of others to become better
thinkers and doers.
The author used problem simulation as a practical way to help us experience the learning
process they are advocating.
The book is unusually good in bringing home the consequences of letting our business/
professional life interfere with our family life.
The pacing of the book is especially good. We are given time to stew with issues and
come up with our own ideas before sample answers are provided by Alex and his team in
the novel. Unlike many books that take complicated ideas and oversimplify them so the
ideas lose their meaning, this book simplifies ideas in ways that enhance their meaning
by making the ideas easier to see and employ.
42
It accurately describes the behaviour of manufacturing facilities, including such fundamental
concepts as bottlenecks, constraints, and the impact of variability. One reason why it has
been so broadly read is that it frames these concepts in the guise of a novel. This makes the
ideas easy to read and digest.
IMPORTANT LESSONS TO BE LEARNT
Some of the lessons of the book include the following:
When we are productive we are accomplishing something in terms of goals. Every action
that brings a company closer to its goal is productive. The goal of a manufacturing
organization is to make money.
Because of variability, a factory cannot be run at 100% of capacity. Or, as Jonah says,
“the closer you come to a balanced plant, the closer you come to bankruptcy.”
One of the biggest problems in improving the factory is collecting the right data. Alex
eventually concludes, “We're going to have to accept the fact that we're not going to have
perfect data to work with.”
“An hour lost at the bottleneck is an hour lost for the entire system. The actual cost of a
bottleneck is the total expense of the system, divided by the number of hours the
bottleneck produces.” This suggests managing bottlenecks very closely.
Non-bottlenecks do not need to be regulated so closely, and should not be operated to
maximize utilization. Jonah says that “activating a non-bottleneck to its maximum is an
act of maximum stupidity.”
43