Industrial Engineering and Production Management
PERT

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

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Industrial Engineering and Production Management
Pessimistic time is

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

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