Industrial Engineering and Production Management
When slack of an activity is negative

The activity is critical and any delay in its performance will delay the completion of whole project
It represents a situation where extra resources are available and the completion of project is not delayed
All of these
It represents that a programme falls behind schedule and additional resources are required to complete the project in time

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

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

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