Industrial Engineering and Production Management
The assumption in PERT is

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
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
Critical Path Net Work helps an engineer

To concentrate his attention on critical activities
All of these
To divert the resources from noncritical advanced activities to critical activities
To be cautious for avoiding any delay in the critical activities to avoid delay of the whole project

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