Difference Between PERT and CPM

PERT and CPM are most important methods in Project Management, In this article we will discuss difference between PERT and CPM with examples, PERT and CPM full form, CPM vs PERT etc.

Difference Between PERT CPM with

PERT and CPM Full Form

As discussed both are commonly used in project management, here is the full form of PERT and CPM

PERT is stands for Project Management and Review Technique

CPM is stands for Critical Path Method 

What is PERT?

PERT is a project management planning tool used to calculate the time it takes to complete a project in a realistic manner. PERT stands for Program Evaluation Review Technique.

PERT is similar to a critical path in that both are used to describe the timeline as well as the research to be completed for a project.

However with PERT, you create three different time estimates for the project: you estimate the shortest possible amount time each task will take, the most probable amount of time, and the longest amount of time tasks might take if things don’t go as planned.

PERT is calculated backward from a fixed end date since contractor deadlines typically cannot be moved.

What is CPM?

The critical path method (CPM), or critical path analysis (CPA), is an algorithm for scheduling as well as planning of a set of project activities.

It is commonly used in conjunction with the program evaluation and review technique (PERT)

Benefits of Critical Path Method

Analysis of critical paths is required to predict the timing of completion of the project.

  • The method visualizes projects in a transparent graphic form. 
  • It determines the tasks which are most relevant. 
  • Saves time and helps in deadline management. 
  • Helps to compare the planned with the actual state. 
  • Identifies all essential activities which need attention. 
  • Makes dependencies clear and transparent.

Also Read: What is Construction


Differences between PERT and CPM


Full form of PERT- Program (Project) Evaluation and Review Technique.

Meaning:- PERT is a methodology for project management.
which is used to handle unpredictable project activities.

Suitable for: Research and Development Project.

Estimates: Three time estimates.

Method: To Control Time.


Full Form of CPM-Critical Path Method.

Meaning: CPM is a statistical project management technique which manages well established project activities.

Suitable for: Non-research based projects for example Civil Engineering Construction, ship building etc.

Estimates: One time estimate.

Method: To Control Time as well as Cost.

Advantages of PERT

  • Planning for Large Project- PERT is used by the project manager when scheduling large projects.
  • Visibility of Critical Path- PERT is used to show the critical path in a clear way.
  • Analysis of Activity- This will provide the management with the progress report and the completion of the project including the budget.
  • Coordination Ability-This helps in improving the communication within different departments of the company.
  • The What-if Analysis– This analysis benefits the company to recognize the risk linked with any projects.

Advantages of CPM

  • Provides a model for long-term project management and preparation.
  • Recognizes critical activities.
  • Easy to plan, schedule, and control project.
  • It improves productivity.
  • Manages the resource needed.

Also Read: Types of Civil Engineering

Example of PERT

example of PERT Method.

Example of CPM

example of CPM Method.

Also Read: Steps In Construction

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