Construction Planning and Management
Earliest finish of an activity is always

Less than or equal to earliest event time of the following node
Greater than earliest event time of the following node
Less than earliest event time of the following node
Greater than or equal to earliest event time of the following node

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

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