Industrial Engineering and Production Management
Pessimistic time is

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

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Industrial Engineering and Production Management
The important file in making a PERT is

Length of arrow has nothing to do with time
An event can't be accomplished until activities leading to it are completed
All of the these
No activity from any event can be started from preceding event till it is completed

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Industrial Engineering and Production Management
PERT

All of the listed here
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

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