Industrial Engineering and Production Management
String diagram is used

Where processes require the operator to be moved from one place to another
All of these
For checking the relative values of various layouts
When a group of workers are working at a place

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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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