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

Its latest start time and earliest start time
Its latest start time and earliest finish 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
At a work site, statistical quality control of concrete means

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

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