Industrial Engineering and Production Management
Expediting function consists in keeping a watch on

Making efficient dispatching
Operator's activity
Minimizing the delays
Flow of material and in case of trouble locate source of trouble

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Industrial Engineering and Production Management
The assumption in PERT is

Activities are fixed and can't be changed
A project will always be behind schedule, if left uncorrected
A project can be subdivided into a set of predictable, independent activities
Cost of project will always be more than the estimated cost, if no timely corrections are taken

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