Industrial Engineering and Production Management
Discrepancies of bar chart techniques are

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

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Industrial Engineering and Production Management
The reasons which are basically responsible for the formation of a queue should be that

The average service rate Hess than the average arrival rate
All of these
Output rate is linearly proportional to input
Output rate is constant and the input varies in a random manner

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