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

Any one of the above
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
It represents a situation where extra resources are available and the completion of project is not delayed

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Industrial Engineering and Production Management
Dispatching

Prescribes the sequence of operations to be followed
Is concerned with the starting of processes
Regulates the progress of job through various processes
Determines the programme for the operations

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