Construction Planning and Management
Free float for any activity is defined as the difference between

its earliest finish time and latest start time for its successor activity
its latest start time and earliest start time
its latest finish time and earliest start time for its successor activity
its earliest finish time and earliest start time for its successor activity

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

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

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