# Essay on Critical Path Method

807 Words Feb 3rd, 2014 4 Pages
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
completion of preceding operation Can operations overlap?

The CPM Approach
Phase II
Create time estimates for each operation Determine earliest possible start date, earliest possible finish date , latest start & finish
Determine “free float” and “total float”

Revised after completion of Phase III

The CPM Approach
Phase III
Establish time-cost relationship Establish scheduling variations
Determine most favorable balance between time-cost

Normal Start – normal time, least cost All-Crash Start – least time, higher cost

The CPM Approach

Definitions
Float (slack) - amount of time that a task can be delayed without causing a delay to: subsequent tasks (free float) project completion date (total float) Critical path is the sequence of activities which add up to the longest overall duration. It is the shortest time possible to complete the project. Any delay of an activity on the critical path directly impacts the planned project completion date (there is no float on the critical path). A

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