Industrial Engineering and Production Management
Discrepancies of bar chart techniques are

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

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Industrial Engineering and Production Management
The assumption in PERT is

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

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