Construction Planning and Management
In time-cost optimization of a project, crashing is done.

On all the activities
On all the activities lying on the critical path
On original critical activities and those that become critical at any stage of crashing in the order of ascending cost slope
Only on activities lying on the original critical path and having flatter cost slopes

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Construction Planning and Management
Whenever an activity has zero total float, then

Independent float must be zero but free float need not be zero
Free float and independent float both need not be zero
Free float and independent float both must be zero
Free float of the activity must be zero but independent float need not be zero

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