Industrial Engineering and Production Management
Discrepancies of bar chart techniques are

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

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Industrial Engineering and Production Management
The assumption in PERT is

Activities are fixed and can't be changed
A project can be subdivided into a set of predictable, independent activities
Cost of project will always be more than the estimated cost, if no timely corrections are taken
A project will always be behind schedule, if left uncorrected

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