Industrial Engineering and Production Management
Time study is

Machine setting time
The appraisal, in terms of time, of the value of work involving human effort
Time taken by workers to do a job
Method of fixing time for workers

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

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

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