Industrial Engineering and Production Management
The important file in making a PERT is

No activity from any event can be started from preceding event till it is completed
An event can't be accomplished until activities leading to it are completed
Length of arrow has nothing to do with time
All of the these

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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

Complete details of items in, waiting line are known
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
Arrival and waiting times are known and can be grouped to form a waiting line model

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Industrial Engineering and Production Management
The assumption in PERT is

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

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