Project Scheduling

Difference Between PERT And CPM



PERT is probabilistic

CPM is deterministic

This technique is developed in 1950 by US Navy

This is developed in 1957 by Du Pont

PERT is event oriented

CPM is activity oriented

PERT is generally used for those projects where time required to complete various activities is not known with certainty.

CPM is used for those projects which are repetitive in nature and where one has experience of handling similar projects.

PERT analysis does not usually consider costs

It deals with the cost of the project schedule and their minimization. The concept of crashing is applied mainly to CPM model.

PERT is used in Research & Development Projects

CPM is used in plant maintenance and construction work

PERT can be used as an important control device as it assists manager to review those activities which may cause a delay in project completion date

It is difficult to use CPM as a controlling device.


Programme Evaluation & Review Technique (PERT): In most of the projects the activity times are not known with certainty and they may be assumed as random variable. In such cases where activity times are not known with certainty PERT can be used for planning, scheduling and controlling the project. It was developed in 1950 by US Navy to control large defense projects.


Critical Path Method technique was developed by Du Pont in 1950 and was first used in missile defense construction projects.

Critical Path: In project management, a critical path is the sequence of project network activities which add up to the longest overall duration, regardless if that longest duration has float or not. This determines the earliest possible time to complete the project. The activities that lie on the critical path are known as critical activities. These are those activities which do not have any cushion time to either postpone or prepone its starting time from its original starting time. Each non-critical activity will have some cushion time so it can be postponed or preponed its starting time from its original time. If the activity of the critical path is delayed, the project completion time will also be delayed.       

Critical Path Method Project Scheduling

Difference between PERT and CPM Difference between PERT and CPM Difference between PERT and CPM

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By Hassham

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