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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Industrial Engineering and Production Management
Micro motion study is

Motion study of a sequence of operations conducted systematically
Analysis of a man-work method by using a motion picture camera with a timing device in the field of view
Study of man and machine conducted simultaneously
Motion study observed on enhanced time intervals

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Industrial Engineering and Production Management
PERT

Provides a way for management to require that planning be done on a uniform and logical basis
Provides an approach for keeping planning up-to-date
All of the listed here
Permits management to foresee quickly the impact of variations from the plan

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