Short time span specific start end point budgetable

short time span
 specific start & end point
 Budgetable in terms of money, resources
 can assign to individual responsibility
 can be scheduled
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Purpose of WBS

Manageable

Independent

Integratable

Measurable
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ABC Project
Programming Design Analysis Definition
Risk Analysis
Feasibility
Study
Requirements
Documentation
...
...
Level 1
Level 2
Level 3

Activity Precedence
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Activity Immediate
Predecessor
Duration
(Week)
A - 2
B - 1
C - 3
D A 2
E B,C 4
F C 5
G D,E 3

Activity-on-Arrow (AOA)
Diagram
G
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1
2 5
3
4
6
B
C
A
F
E
D
Each activity has only one arrow
associated with it.

AON Network
Characteristics

Construct from left to right

Any activity can have only one start node

No two activity can have the same start and end node

Dummy activities are used in AOA

Start the network by finding those activities that have no
predecessors

Calculate activity times using probabilistic or
deterministic means
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Construct Project Planning
Diagram

Draw the logical sequence of activities

Precedence Diagramming Method (PDM)

Activity on Node (AON)

Arrow Diagramming Method (ADM)
 Activity on Arrow (AOA)
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Terms

Activity - A task or job which takes time & use up
resources
 Represented by labeled arrow A

Event - An instantaneous point representing the start or
finish of an activity
 Represented by node
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1

Dummy Activity

Represented by dotted arrow

Used when relationships between activities require no
work

Applied when
 two activities start and end similarly
 succeeding activities have partial dependencies on
predecessor activities
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PERT and CPM
PERT

R&D Development

Originally focused on
time only

Uses probabilistic time
estimates

AOA based

Critical path & slack
CPM

Construction

Time and Cost

Uses deterministic time
estimates

AON based

Critical path & slack

Used in most software
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Critical Path

By drawing a network diagram, you can figure out
the critical path of your project.

The critical path is the longest path through the
network. If something falls behind schedule on the
critical path, the whole project falls behind schedule
unless time is made up elsewhere.