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
All variables and constants are known and form a linear equation
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

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Industrial Engineering and Production Management
Routing

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

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Industrial Engineering and Production Management
Activity slack or float of any event on a PERT/CPM chart is represented by

Latest finish time of event earliest finish time of the event
Latest start time of the event earliest start time of the event
Anyone of the above
Latest start time of succeeding event earliest finish time of preceding event activity time

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Industrial Engineering and Production Management
A big advantage of PERT over Gantt charts is that in the former case

Interrelationship among activities is clearly shown
Early start and late finish of an activity are clearly marked
Activity times are clear
Activities and events are clearly shown

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