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

An event can't be accomplished until activities leading to it are completed
Length of arrow has nothing to do with time
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

Permits management to foresee quickly the impact of variations from the plan
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

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