Industrial Engineering and Production Management
The assumption in PERT is

A project will always be behind schedule, if left uncorrected
Cost of project will always be more than the estimated cost, if no timely corrections are taken
Activities are fixed and can't be changed
A project can be subdivided into a set of predictable, independent activities

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Industrial Engineering and Production Management
Scheduling

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

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

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

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