Industrial Engineering and Production Management
Pick up the incorrect statement about advantages of work sampling

Simultaneous study of many operators may be made by a single observer
No time measuring devices are generally needed
Calculations are easier, method is economical and less time consuming
Permits a fine breakdown of activities and delays

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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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