PERT vs. CPM

 

Basic

PERT

CPM

Stands for

 

 PERT stands for “Program Evaluation and Review Technique”. CPM stands for “Critical Path Method”.

Model

 It is a probabilistic model under which the result estimated in a manner of probability. It is a deterministic model under which the result is ascertained in a manner of certainty.

Time

 It deals with the activities of uncertain time. It deals with the activities of precise well known time.

Jobs

 It is used for onetime projects that involve activities of non-repetitive nature . It is used for completing of projects that involve activities of repetitive nature.

Orientation

 It is activity oriented in as much as its result is calculated on the basis of the activities. It is even oriented, in as much as its results are calculated on the basis of the events.

Dummy Activities

 It does not make use of dummy activities. It makes use of dummy activities to represent the proper sequencing of the activities.

Cost

 It has nothing to do with cost of a project. It deals with the cost of a project schedules and their minimization.

Estimation

 It finds out expected time of each activity on the basis of three types of estimates. Its calculation is based on one type of time estimation that is precisely known.

Time

 PERT is restricted to time variable. CPM includes time-cost trade off.