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

It represents that a programme falls behind schedule and additional resources are required to complete the project in time
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
All of these

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Industrial Engineering and Production Management
Work study is mainly aimed at

Establishing the minimum time of completion of a job
Economizing the motions involved on the part of the worker while performing 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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