Construction Planning and Management
Earliest finish of an activity is always

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

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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 need not be zero
Free float and independent float both must be zero

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