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
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

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Industrial Engineering and Production Management
The essential condition for the decompression of an activity is that

An activity could be decompressed to the maximum extent of its normal time
An activity could be decompressed to the maximum extent of its normal time
After decompression the time of an activity invariably exceeds its normal time
The project time should change due to decompression

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