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

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

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Construction Planning and Management
At a work site, statistical quality control of concrete means

Measurement of risks to eliminate failures
Applying the theory' of probability to sample testing or inspection
Reduction in costs for the removal of defects
Reduction in wastage of inspection costs

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