Difference Between PERT and CPM

1. Project Evaluation and Review Technique (PERT) :
PERT is appropriate technique which is used for the projects where the time required or needed to complete different activities are not known. PERT is majorly applied for scheduling, organization and integration of different tasks within a project. It provides the blueprint of project and is efficient technique for project evaluation .

2. Critical Path Method (CPM) :
CPM is a technique which is used for the projects where the time needed for completion of project is already known. It is majorly used for determining the approximate time within which a project can be completed. Critical path is the largest path in project management which always provide minimum time taken for completion of project

Difference between PERT and CPM :

S.No. PERT CPM
1. PERT is that technique of project management which is used to manage uncertain (i.e., time is not known) activities of any project. CPM is that technique of project management which is used to manage only certain (i.e., time is known) activities of any project.
2. It is event oriented technique which means that network is constructed on the basis of event. It is activity oriented technique which means that network is constructed on the basis of activities.
3. It is a probability model. It is a deterministic model.
4. It majorly focuses on time as meeting time target or estimation of percent completion is more important. It majorly focuses on Time-cost trade off as minimizing cost is more important.
5. It is appropriate for high precision time estimation. It is appropriate for reasonable time estimation.
6. It has Non-repetitive nature of job. It has repetitive nature of job.
7. There is no chance of crashing as there is no certainty of time. There may be crashing because of certain time boundation.
8. It doesn’t use any dummy activities. It uses dummy activities for representing sequence of activities.
9. It is suitable for projects which required research and development. It is suitable for construction projects.

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