Industrial Engineering and Production Management
The assumption in PERT is

A project will always be behind schedule, if left uncorrected
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
Activities are fixed and can't be changed

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Industrial Engineering and Production Management
PERT

All of the listed here
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
Permits management to foresee quickly the impact of variations from the plan

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