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
Activities are fixed and can't be changed
A project can be subdivided into a set of predictable, independent activities
A project will always be behind schedule, if left uncorrected

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Industrial Engineering and Production Management
Work study is mainly aimed at

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

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