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

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

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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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