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Understanding PERT and CPM: Project Scheduling Techniques from the Late 1950s

Explore the foundational project scheduling techniques of the late 1950s: Program Evaluation and Review Technique (PERT) and Critical Path Method (CPM). Developed by key players such as the U.S. Navy and Booz-Allen Hamilton, these methodologies utilize probabilistic and deterministic activity durations to optimize project timelines. Learn about essential concepts like activities, events, milestones, and critical paths, as well as the nuances of Activity on Arrow (AOA) and Activity on Node (AON) networks. This guide is essential for anyone interested in effective project management.

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Understanding PERT and CPM: Project Scheduling Techniques from the Late 1950s

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  1. Project Scheduling IOM580 Hiroshi Ochiumi

  2. PERT and CPM • Late 1950s • Program Evaluation and Review Technique (PERT) • U.S. Navy, Booz-Allen Hamilton, and Lockeheed Aircraft • Probabilistic activity durations • Critical Path Method (CPM) • Dupont De Nemours Inc. • Deterministic activity durations

  3. The Language of PERT/CPM • Activity • task or set of tasks • use resources • Event • state resulting from completion of one or more activities • consume no resources or time • predecessor activities must be completed

  4. The Language of PERT/CPM • Milestones • events that mark significant progress • Network • diagram of nodes and arcs • used to illustrate technological relationships • Path • series of connected activities between two events

  5. The Language of PERT/CPM • Critical Path • set of activities on a path that if delayed will delay completion of project • Critical Time • time required to complete all activities on the critical path

  6. Building the Network • AOA Network • AON Network

  7. Example 1

  8. AON Network

  9. AOA Network

  10. Example 2

  11. Critical Path/Time • Determine ES and EF times for each activity • Determine LS and LF times for each activity • Slack = LST – EST = LFT – EFT

  12. Example 2

  13. Example 3

  14. AON Network

  15. Critical Path and Time

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