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

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

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Construction Planning and Management
During the construction period, price variation clause in contracts caters to

Rate of inflation
Increase in rates of only important materials
Variation in total cost of the project on an ad hoc basis
Variation in cost in materials element, labour element and petrol-oil-lubricant element

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