Industrial Engineering and Production Management
Discrepancies of bar chart techniques are

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

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Industrial Engineering and Production Management
The critical path of a network represents

Minimum cost required for completion of project
The maximum time required for completion of project
Maximum cost required for completion of project
The minimum time required for completion of project

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