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CPM vs. PERT

CPM or "Critical Path Method":

tool to analyze project and determine duration, based on identification of "critical path" through an activity network. Knowledge of the critical path can permit management of the project to change duration. A single estimate for activity time was used that did not allow for variation in activity times Activity times are assumed to be known or predictable ("deterministic") Activities are represented as nodes or circles

PERT or "Project Evaluation and Review Technique":

  • Another derivative of the GANTT chart
  • Multiple time estimates were used for each activity that allowed for variation in activity times
  • Activity times are assumed to be random, with assumed probability distribution ("probabilistic")
  • Activities are represented by arrowed lines between the nodes or circles
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