Construction Planning and Management
Crash project duration is obtained by summing the

Normal durations for all the activities
Crash durations for all activities
Crash durations for all the activities along the critical path obtained by taking into account the normal duration for all the activities
Crash durations for all the activities along the critical path obtained by taking into account the crash duration for all the activities

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Construction Planning and Management
Free float is mainly used to

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

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