Industrial Engineering and Production Management
Discrepancies of bar chart techniques are

Free time available for an activity can't be predicted
Effective monitoring/controlling can't be done
All of these
Consequential effects of lack in one activity on the finish date

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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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