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

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

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

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

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