Industrial Engineering and Production Management
The assumption in PERT is

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

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Industrial Engineering and Production Management
When slack of an activity is negative

It represents a situation where extra resources are available and the completion of project is not delayed
It represents that a programme falls behind schedule and additional resources are required to complete the project in time
The activity is critical and any delay in its performance will delay the completion of whole project
All of these

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