Industrial Engineering and Production Management
The basic difference between PERT and CPM is that

Critical path is determined in PERT only
Costs are considered on CPM only and not in PERT
Guessed times are used in PERT and evaluated times in CPM
PERT deals with events and CPM with activities

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Industrial Engineering and Production Management
Work study is mainly aimed at

Developing the standard method and standard time of a job
Determining the most efficient method of performing a job
Economizing the motions involved on the part of the worker while performing a job
Establishing the minimum time of completion of a job

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