Project Management Pert

In: Business and Management

Submitted By Petemiller
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Chapter 13 Project Management

Characteristics of a “project”:
■ A

project is unique (not routine), ■ A project is composed of interrelated sub-projects/activities, ■ It is associated woth a large investment.

What is Project Management
■ To

schedule and control the progress and cost of a project.

PERT/CPM:


Input:
– – –

Activities in a project; Precedence relationships among tasks; Expected performance times of tasks. The earliest finish time of the project; The critical path of the project; The required starting time and finish time of each task; Probabilities of finishing project on a certain date; ...



Output:
– – – – –

PERT/CPM is supposed to answer questions such as:
■ How

long does the project take? ■ What are the bottle-neck tasks of the project? ■ What is the time for a task ready to start? ■ What is the probability that the project is finished by some date? ■ How additional resources are allocated among the tasks?

PERT Network:
• • • •



It is a directed network. Each activity is represented by a node. An arc from task X to task Y if task Y follows task X. A ‘start’ node and a ‘finish’ node are added to show project start and project finish. Every node must have at least one outgoing arc except the ‘finish’ node.

Example of Foundry Inc., p.523
Activity A B C D E F G H Immediate Predecessors A B C C D, E F, G

PERT Network for Foundry Inc. Example

Example of a Hospital Project:
Activity
A B C D E F G H I J K

Immediate Predecessor(s)
— — A B B A C D A E, G, H F, I, G

PERT Network for Hospital Project

Performance Time t of an Activity
§

t is calculated as follows: a + 4m + b t = 6 where a=optimistic time, b=pessimistic time, m=most likely time.

§

Note: t is also called the expected performance time of an activity.

Variance of Activity…...

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