Compare PERT and CPM.  (Oct 2003)

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CPM

PERT

1. In CPM there is only one time given for each activity. 1. In PERT there are three time estimates. Optimistic time, Most likely time and Pessimistic time.

From these, we find Expected time for completion of an activity (te).

2. After drawing the network we find critical path. 2. We draw the network using Expected time (te) and then we find critical path.
3. There is no probability information in CPM. 3. Probability is associated with Project completion time (Te). The probability of completing the project in that duration is 50% (0.5).
4. There is no standard deviation and variance for activities. We assume that all activities will be completed in specified time. 4. We find standard deviation and variance of critical activities and from that we find variance and standard deviation of critical path.
5. As there is no probability, there is no relation with normal distribution table. 5. We can find “z” value and from “z” value the probability of completing the project in specified time duration.

 

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