Industrial Engineering and Production Management
The assumption in PERT is

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

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Industrial Engineering and Production Management
Work study is mainly aimed at

Determining the most efficient method of performing a job
Developing the standard method and standard time of a job
Economizing the motions involved on the part of the worker while performing a job
Establishing the minimum time of completion of a job

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