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

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

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Industrial Engineering and Production Management
Pick up the incorrect statement about advantages of work sampling

Calculations are easier, method is economical and less time consuming
No time measuring devices are generally needed
Simultaneous study of many operators may be made by a single observer
Permits a fine breakdown of activities and delays

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