Compare PERT and CPM.  (Oct 2003)





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.


The following two tabs change content below.

Score Tutorial

S’COrE Education is a professional coaching institute to coach for new generation courses. S’COrE has highly experienced faculty with enormous experience and achievement in teaching and industry. We teach each subject in such a manner that even complicated subject feels simple. This helps student to S’COrE-the-Max. Since 1998 S’COrE had university toppers accross courses and subjects. Once you are our student you will also believe S’COrE - the - Best !!

Leave a reply is aimed at revolutionising Bachelors in Management Studies education, also known as BMS for students appearing for BMS exams across all states of India. We provide free study material, 100s of tutorials with worked examples, past papers, tips, tricks for BMS exams, we are creating a digital learning library.

Disclaimer: We are not affiliated with any university or government body in anyway.

©2020 BMS - Bachelor of Management Studies Community 

A Management Paradise Venture

Ask Us On WhatsApp

Log in with your credentials


Forgot your details?


Create Account