Construction Planning and Management
Earliest finish of an activity is always

Greater than or equal to earliest event time of the following node
Greater than earliest event time of the following node
Less 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
Free float is mainly used to

Establish priorities
Identify the activities, which can be delayed without affecting the total float of succeeding activity
Identify the activities which can be delayed without affecting the total float of preceding activity
Identify the activities which can be delayed without affecting the total float of either the preceding or succeeding activities

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