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
Which of the following are the guidelines for the construction of a network diagram?

Dangling must be avoided in a network diagram
Dummy activity consumes no time or resource
All of the these
Each activity is represented by one and only one arrow in the network

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