What is the difference between CPM and PERT?

The Major Differences and Similarities between PERT and CPM

PERT(Program Evaluation and Review Technique) | CPM (Critical Path Method)

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1)PERT is a probabilistic tool used with three 1)CPM is a deterministic tool, with only single

Estimating the duration for completion of estimate of duration.

activities.

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2)This tool is basically a tool for planning 2)CPM also allows and explicit estimate of

and control of time. costs in addition to time, therefore CPM can

control both time and cost.

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3)PERT is more suitable for R&D related 3)CPM is best suited for routine and those

projects where the project is performed for projects where time and cost estimates can

the first time and the estimate of duration be accurately calculated.

are uncertain.

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4)The probability factor i major in PERT 4)The deterministic factor is more so values or

so outcomes may not be exact. outcomes are generally accurate and

realistic.

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Extensions of both PERT and CPM allow the user to manage other resources in addition to time and money, to trade off resources, to analyze different types of schedules, and to balance the use of resources.tensions of both PERT and CPM allow the user to manage other resources in addition to time and money, to trade off resources, to analyze different types of schedules, and to balance the use of resources.