In this note, we are going to know about a topic called “PERT Vs CPM in Project Management” or Difference between PERT and CPM. Welcome to Poly Notes Hub, a leading destination for engineering notes.

Author Name: Arun Paul.

PERT Vs CPM in Project Management

Below we listed some Difference between PERT and CPM –

Aspect	PERT (Program Evaluation and Review Technique)	CPM (Critical Path Method)
Objective	Estimate time required for project completion, with focus on variability and uncertainty.	Determine the critical path and shortest project duration.
Focus	Time-based analysis	Time and cost-based analysis
Variability	Accounts for uncertainty by using three time estimates: optimistic, most likely, and pessimistic.	Assumes deterministic time estimates.
Calculation	Uses 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.
Formula	TE = (O + 4M + P) / 6	–
Path Determination	Doesn’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 Time	Utilizes Slack Time to analyze the flexibility of non-critical activities.	Doesn’t typically calculate slack time as it focuses on the critical path.
Application	Suitable for projects with high uncertainty and where time estimates are variable.	Appropriate for projects with well-defined activities and deterministic time estimates.
Example	Research and development projects, where tasks may have varying durations due to research uncertainties.	Construction projects, where tasks have fixed durations and dependencies.