11-1
CHAPTER11
Master SchedulingCovers pages 493-498.
Homework problems # 19,20,21,22 on page 506.
11-2
Master SchedulingMaster Scheduling
The heart of production planning and control It determines the quantity needed to meet demand from
all sources It interfaces with
Marketing Capacity planning Production planning Distribution planning
Provides senior management with the ability to determine whether the business plan and its strategic objectives will be achieved
11-3
The Master SchedulerThe Master Scheduler
The master scheduler’s duties: Evaluating the impact of new orders Providing delivery dates for orders Deals with problems
Evaluating the impact of production or delivery delays
Revising master schedule when necessary because of insufficient supplies or capacity
Bring instances of insufficient capacity to the attention of relevant personnel so they can participate in resolving conflicts
11-4
Master Scheduling ProcessMaster Scheduling Process
11-5
Projected On-hand InventoryProjected On-hand Inventory
Projected on-handinventory
Inventory fromprevious week
Current week’srequirements
-=
11-6
Projected On-hand InventoryProjected On-hand Inventory
11-7
Projected On-hand InventoryProjected On-hand Inventory
11-8
Available to Promise (ATP) ConceptAvailable to Promise (ATP) Concept
The available to promise (ATP) is the period’s MPS quantity minus the sum of customer orders occurring before the next MPS receipt. During the first master schedule period, the ATP quantity includes the on-hand balance (inventory).
The ATP quantity is only calculated for the first week and for subsequent weeks in which there is an MPS quantity.
11-9
Available to Promise (ATP) CalculationAvailable to Promise (ATP) Calculation
a. Concept
Amount of MPS that can still use to meet new booking requests, considering current on-hand,
MPSt , and COt
b. First Week:
ATP=current OH + MPS in first week - cumulative COt occurring before the next MPS receipt.
c. Subsequent Weeks:
Only for weeks when an MPS quantity arrives.
ATP= MPS of the week - cumulative COt
occurring before the next MPS receipt.
11-10
Available to Promise (ATP)Available to Promise (ATP)
11-11
ATP ExampleATP Example
Item: 3-in. gate valve Order Policy: 80 units
Quantity on Hand: 45
Forecast
April May
2020
1
MPS quantity 00
Customer orders (booked)
2323
Projected on-hand inventory
2222
2020
2
00
1515
22
ATP inventory 77
2020
3
8080
88
6262
6868
2020
4
00
44
4242
4040
5
00
00
22
4040
6
8080
00
4242
8080
4040
7
00
00
22
4040
8
8080
00
4242
8080
11-12
Based on the previous slide, should the following orders be accepted?
Order Amount (units) Week Requested
1 5 2
2 38 5
3 24 3
4 15 4
ATP Order-Acceptance ExampleATP Order-Acceptance Example
11-13
Updated ATPUpdated ATP
Item: 3-in. gate valve Order Policy: 80 units
Quantity on Hand: 45
Forecast
April May
2020
1
MPS quantity 00
Customer orders (booked)
2323
Projected on-hand inventory
2222
2020
2
00
2020
22
ATP inventory 22
2020
3
8080
3232
5050
66
2020
4
00
44
3030
4040
5
00
3838
-10-10
4040
6
8080
00
3030
8080
4040
7
00
00
-10-10
4040
8
8080
00
3030
8080