Industrial Engineering and Production Management
Slack represents the difference between the

Normal allowable time and the latest expected time
Latest allowable time and the earliest expected time
Proposed allowable time and the earliest expected time
Latest allowable time and the normal expected time

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Industrial Engineering and Production Management
Dispatching

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

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Industrial Engineering and Production Management
In queuing theory, the nature of the waiting situation can be studied and analysed mathematically if

Arrival and waiting times are known and can be grouped to form a waiting line model
The laws governing arrivals, service times, and the order in which the arriving units are taken into source are known
Complete details of items in, waiting line are known
All variables and constants are known and form a linear equation

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