Industrial Engineering and Production Management
The basic difference between PERT and CPM is that

Critical path is determined in PERT only
PERT deals with events and CPM with activities
Guessed times are used in PERT and evaluated times in CPM
Costs are considered on CPM only and not in PERT

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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

All variables and constants are known and form a linear equation
Complete details of items in, waiting line are known
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

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