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Chapter 8: PERT, CPM, GERT. Originated from Govern./Research (Navy/Lockheed) Focus on time Optimistic, most likely and pessimistic time . Originated from private Industry Focus on cost Crash Time and Crash cost. PERT x CPM (both 1950s). PERT Formulas p.231-232.

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pert x cpm both 1950s
Originated from Govern./Research

(Navy/Lockheed)

Focus on time

Optimistic, most likely and pessimistic time

Originated from private Industry

Focus on cost

Crash Time and Crash cost

PERT x CPM (both 1950s)
pert formulas p 231 232
PERT Formulas p.231-232

Optimistic, most likely, and pessimistic time

Estimated time of task

Estimate Variance of task

Estimated time of project

Estimated variance of project

Z

slide4
CPM

Based on idea that a project has a Normal Time to complete a job. Normal time is the cheapest. If it takes longer or shorter, it will

usually be more expensive.

Why ?

to crash a project pm may need one or more of the below resulting in great cost
To crash a project , PM may need one or more of the below, resulting in great cost
  • Overtime workers
  • Use breakthrough equipment
  • Start a phase of the project (Design, for example) before a pre-requisite phase is completed (Analysis, for example)
  • Hire consultants.
which task to crash
Which Task to Crash ?
  • Not a steep slope (big decrease in time with only little increase in cost)
  • Task that is part of the CP.
  • Crashing the task will not have a negative colateral result to the rest of the company’s activities or projects (for example, need to stop something else to crash that task).
gert different from others because
GERT, different from others because:
  • Not all immediate predecessor activities must be completed before activity is started
  • Looping back is permitted.
  • Percentage probability
tasks not completed
Tasks not completed

Q: Example of a project where not all tasks need to be completed for the project to be completed ?

A2: You research three different possible solutions to cure cancer (three different groups). Once one group solves the problem, other group (tasks) can be disactivated.

A1: To decide if you give credit or not to somebody you do three types of credit check. If any two comes through with success, credit is conceived.