Industrial Engineering and Production Management
One of the basic essentials of an incentive plan is that

Provide incentive to group efficiency performance
A differential piece rate system should exist
All standards should be based on time studies
Minimum wages should be guaranteed

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

All of these
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
It represents a situation where extra resources are available and the completion of project is not delayed

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