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
When slack of an activity is positive

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

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