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

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

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Industrial Engineering and Production Management
Work sampling is applied for

All of these
Estimation of the percentage utilization of machine tools
Finding out time standards, specially where the job is not repetitive and where time study by stop watch method is not possible
Estimating the percentage of the time consumed by various job activities

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