Network Tech

8/7/2019 Network Tech

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Project ManagementProject Management

Karen J Kirkby DJ 18 01

School of Electronics & Physical Sciences


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ContentsC

ontents

2 Lectures + 1 Assignment

Why Plan?

What Plan

Project Manager/ Leader

Network Analysis

Critical Path

Gantt charts

PERT


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AssignmentAssignment

Week 6

Friday Lab groups

Tuesday 15:00 - 17:00

Tuesday Lab groupsFriday 15:00 - 17:00

(see timetable)


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WHY PLAN?WHY PLAN?

Why do projects fail?

Failing to plan is planning to fail


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Reappraise

Project

What Plan?What Plan?Define Project

Define Tasks

Define Plan

MonitorProgress

CommenceWork

AimsSpecFeasibility

Subprojects

DependenciesTime

Resources

Facilities

ReviewsTargetsCosts

CompleteProject

RedefineProject

CorrectiveAction


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The Project ManagerThe Project ManagerAbilities

* Organise & plan

* People Management* Communication skills

* Problem solving

*Technical knowledge

* Enthusiasm & ability to motivate

* Focussed

* Ability to change


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Network AnalysisNetwork Analysis

* Break project down into manageable sub-groups

* Define tasks in sub-group

* Establish linkages & dependencies between tasks

* Establish order in which tasks undertaken

* Establish sequential and parallel tasks

* Determine time & resources for each task

* Project objectives clearly defined


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Activity on node diagrams

activity - rectangular box

linked by arrows - order


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NETWORK ANALYSISNETWORK ANALYSIS

1. open cereal box

1

2. put cereal in bowl

2

3. fetch milk from fridge

3 4

4. add milk to cereal EAT

Simple example - Breakfast


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OK that was a simple example

Now move on to a more realistic case

Same principles

Break down problem into activities

What is the activityWhat has to precede that activity

How long does the activity take

Dont panic


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ACTIVITY DURATION PRECURSORSA 4 -B 3 -C 6 A,BD 1 BE 7 DF 2 CG 5 C,EH 8 E

J 4 GK 5 F,GL 6 J,HM 3 L,K

DURATION

L

6

START

0

A

4

C6

D

1

F

2

E

7

B

3

K

5

H

8

FINISH

0

M

3

G

5

J

4


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Project ManagementProject Management

Karen J Kirkby DJ 18 01

School of Electronics & Physical Sciences


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ContentsC

ontents2 Lectures + 1 Assignment

Why Plan?

What Plan


Network Analysis

Critical Path

Gantt charts

PERT


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Activity on node diagrams in which finish to start

(F-S) links have a duration will now be considered

Nature and duration of link shown on arrow(F-S) Activity 2 cannot start until 1 week after

completion of activity 1.

1 2F-S (1) 3F-S (2)

Activity 3 cannot start until 2 weeks after completion of

activity 2


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Activity Duration Precursor Link L duration

C 12 B S-S 6

F-F 3

A

A 4 -

0 4

40 4 B

F-S (0)

B 24 A F-S 0

4 28

284 24

C

10 31

3119 12

S-S (6)

Can start 6 weeks after the start of B 4+6 = 10

F-F (3)

Has to finish 3 weeks after the end of B 28+3 = 31

Critical Path


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Gantt ChartsGantt ChartsDeveloped by Henry Gantt during the first world war

Activities drawn as bars across a time map

A

B

C

D

E

F

GH

J

K

L

M

Critical path Non critical activity


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PERTPERT

Programme Evaluation & Review Technique

Developed by US Navy 58-60 for Polaris submarine

construction programme

PERT takes into account the difficulty of estimating duration

of activity

So uses:

most optimistic duration

most pessimistic duration

most likely duration


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PERTPERT

6bm4ate !

6

abs

!

uses a F frequency distribution

calculates the expected mean duration and the

standard deviation as follows:

te = expected mean duration

a = most optimistic duration b = most pessimistic

duration

m = most likely duration s = standard deviation


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PERTPERTACTIVITY a m b PRECURSORS

A 3 5 9 -

B 4 6 8 -

C 5 8 10 A,B

D 3 6 9 B

E 6 9 15 D

F 3 4 5 C

G 8 12 15 C,E

H 2 6 8 E

J 4 7 9 G

K 3 5 10 F,G

L 7 9 11 J,H

M 10 12 15 L,K

ACTIVITY te s

A 5.3 1

B 6 0.67

C 7.8 0.83

D 6 1

E 9.5 1.5

F 4 0.33

G 11.8 1.17

H 5.7 1

J 6.8 0.83

K 5.5 1.17

L 9 0.67

M 12.2 0.83


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PERTPERTThe variance for the project duration is the sum of

the variances of the activities along the critical path

The standard deviation for the duration of

the project is the square root of the variance


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ConclusionsC

onclusions

Why Plan?

What Plan


Network Analysis

Critical Path

Gantt charts

PERT

Documents

Network Tech