Industrial Engineering and Production Management
The assumption in PERT is

A project will always be behind schedule, if left uncorrected
Activities are fixed and can't be changed
A project can be subdivided into a set of predictable, independent activities
Cost of project will always be more than the estimated cost, if no timely corrections are taken

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Industrial Engineering and Production Management
PERT

Permits management to foresee quickly the impact of variations from the plan
All of the listed here
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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Industrial Engineering and Production Management
A big advantage of PERT over Gantt charts is that in the former case

Activities and events are clearly shown
Interrelationship among activities is clearly shown
Early start and late finish of an activity are clearly marked
Activity times are clear

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