Industrial Engineering and Production Management
Discrepancies of bar chart techniques are

Free time available for an activity can't be predicted
All of these
Effective monitoring/controlling can't be done
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

Costs are considered on CPM only and not in PERT
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

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