Industrial Engineering and Production Management
Pessimistic time is

The minimum time in which an activity can possibly be accomplished
The average time required for a job
The maximum time which an activity might require
The most probable time considering all conditions

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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
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

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