Construction Planning and Management
Free float is mainly used to

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

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Construction Planning and Management
Latest start of an activity is always

less than or equal to latest event time of preceding node
greater than or equal to latest event time of preceding node
equal to latest event time of preceding node
less than latest event time of preceding node

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