Industrial Engineering and Production Management
Work study is mainly aimed at

Economizing the motions involved on the part of the worker while performing a job
Establishing the minimum time of completion of a job
Determining the most efficient method of performing a job
Developing the standard method and standard time of a job

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

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

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