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 will always be behind schedule, if left uncorrected
A project can be subdivided into a set of predictable, independent activities

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Industrial Engineering and Production Management
Pick up the incorrect statement from the following. A critical ratio scheduling

Adjusts automatically changes in activity progress
Determines the status of each activity
All of the these
Establishes the relative priorities among various activities on a common basis

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