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

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
Simultaneous study of many operators may be made by a single observer

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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
Cost of project will always be more than the estimated cost, if no timely corrections are taken
A project can be subdivided into a set of predictable, independent activities

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