Industrial Engineering and Production Management
Time study is

Machine setting time
Method of fixing time for workers
The appraisal, in terms of time, of the value of work involving human effort
Time taken by workers to do a job

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Industrial Engineering and Production Management
Pessimistic time is

The most probable time considering all conditions
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

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