Project Management
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It is developed by U.S. Navy to handle uncertain activity times, initially for the Polaris missile nuclear submarine project.
PERT/Program Evaluation and Review Technique
It is developed by DuPont & Remington Rand in 1957 for industrial projects for which activity times generally were known.
CPM/Critical Path Method
Have been used to plan, schedule, and control a wide variety of projects.
PERT & CPM
the maximum of the earliest finish times of all activities immediately preceding activity. (O for those with no predecessors)
ES/Earliest Start Time
(Earliest Start Time) + (Time to complete activity)
EF/Earliest Finish Time
the minimum ot the latest start times
LS/Latest Finish Time
(Latest Finish Time - (Time to complete activity)
LS/Latest Start Time
How to calculate slack time?
Slack=(LS)-(ES), or =(LF)-(EF)