Critical Path Method

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CRITICAL PATH METHOD
(CEE 320 – VDC SEMINAR) 4 February 2009

Jesse Santiago & Desirae Magallon

Overview
Background & History CPM Defined The CPM approach Definitions Class Exercise

Background & History
Developed in the 1950s by the US Navy Originally, the critical path method considered only logical dependencies between terminal elements Since then, it has been expanded to allow for the inclusion of resources related to each activity, through processes called activity-based resource assignments and resource leveling. Critical Path Method for the construction industry
Non-computer approach John Fondahl

John Fondahl
Stanford CE Professor Emeritus – 35 years Passed away last September 13th, 2008 US Marine Corps Sergeant in
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Critical activity – activity with zero float Resource leveling – iterative process of assigning crews to activities in order to calculate their duration

Definitions
Activity Identity box
Early Start (ES) Early Finish (EF)

Activity ID
Late Start (LS) Late Finish (LF)

Duration

Class Exercise
A STAR T C G H B D F
Activity ID A B C D E F G H Duration 7 3 6 3 3 2 3 2 A B D,F B C E,G Dependency

E

Class Exercise
0 A 0 7 7 7 7 7 C 6 13 13 13 13 G 3 16 16 H 16 0 B 7 3 10 10 3 3 D 3 13 13 6 6 E 3 16 9 2 18 18 16

3 F 11

5 2 13

Class Exercise
Gantt Chart

Summary
Critical Path Analysis is an effective and powerful method of assessing: Tasks which must be carried out Where parallel activity can be carried out The shortest time in which a project can be completed Resources needed to achieve a project The sequence of activities, scheduling, and timings involved Task priorities

References
Fondahl, John W., “Non-Computer Approach to the Critical Path Method for the Construction Industry”, Report #9, Stanford University, 1961 Fondahl, John W. “The History of Modern Project Management – Precedence Diagramming Methods: Origins and Early Development”. Project Management Journal. Volume XVIII. No. 2. June 1987. Hendrickson, Chris & Au, Tung, Project Management for Construction, Prentice Hall, 1989 Weber, Sandra C., Scheduling Construction
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