PERT Vs CPM in Project Management | New Topic [2024]

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Author Name: Arun Paul.

PERT Vs CPM in Project Management

Below we listed some Difference between PERT and CPM –
AspectPERT (Program Evaluation and Review Technique)CPM (Critical Path Method)
ObjectiveEstimate time required for project completion, with focus on variability and uncertainty.Determine the critical path and shortest project duration.
FocusTime-based analysisTime and cost-based analysis
VariabilityAccounts for uncertainty by using three time estimates: optimistic, most likely, and pessimistic.Assumes deterministic time estimates.
CalculationUses Expected Time (TE) = (O + 4M + P) / 6, where O = Optimistic Time, M = Most Likely Time, P = Pessimistic Time.Relies on a single time estimate for each activity.
FormulaTE = (O + 4M + P) / 6–
Path DeterminationDoesn’t necessarily identify the critical path, instead focuses on estimating project completion time.Identifies the critical path, which is the longest path through the network diagram and determines the shortest project duration.
Slack TimeUtilizes Slack Time to analyze the flexibility of non-critical activities.Doesn’t typically calculate slack time as it focuses on the critical path.
ApplicationSuitable for projects with high uncertainty and where time estimates are variable.Appropriate for projects with well-defined activities and deterministic time estimates.
ExampleResearch and development projects, where tasks may have varying durations due to research uncertainties.Construction projects, where tasks have fixed durations and dependencies.
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