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
Pessimistic time is

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

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Industrial Engineering and Production Management
The purpose of micro-motion study is to

All of these
Train the individual operator regarding the motion economy principles
Assist in finding out the most efficient way of doing work
Help in collecting the motion time data for synthetic time standards

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