Construction Planning and Management
In the time-cost optimisation, using CPM method for network analysis, the crashing of the activities along the critical path is done starting with the activity having

Longest duration
Least cost slope
Shortest duration
Highest cost slope

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Construction Planning and Management
Earliest finish of an activity is always

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

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