Chapter 8: PERT, CPM, GERT - PowerPoint PPT Presentation

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Chapter 8: PERT, CPM, GERT

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Chapter 8: PERT, CPM, GERT PERT x CPM (both 1950s) Originated from Govern./Research (Navy/Lockheed) Focus on time Optimistic, most likely and pessimistic time ... – PowerPoint PPT presentation

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Title: Chapter 8: PERT, CPM, GERT


1
Chapter 8 PERT, CPM, GERT
2
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

3
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

4
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 ?

5
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.

6
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 companys
    activities or projects (for example, need to stop
    something else to crash that task).

7
GERT, different from others because
  • Not all immediate predecessor activities must be
    completed before activity is started
  • Looping back is permitted.
  • Percentage probability

8
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.

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