Industrial Engineering and Production Management
Discrepancies of bar chart techniques are

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

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Industrial Engineering and Production Management
When slack of an activity is negative

The activity is critical and any delay in its performance will delay the completion of whole project
It represents that a programme falls behind schedule and additional resources are required to complete the project in time
All of these
It represents a situation where extra resources are available and the completion of project is not delayed

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