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
Critical Path Net Work helps an engineer

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
To concentrate his attention on critical activities
All of these

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