BACKWARD PASS : The project completion time is called as the ‘CONTRACUTAL OBLIGATION TIME’. is the latest time (TL) by which the last event in the project should occur.
If the contractual obligation Time is not specified, the earliest time (TE) for the last event should be the value assume by the latest time (TL) of the last event.
Once the TL value for the last event is known, we proceed in the backward direction through the network calculating the values of TL for the earlier events till the start event is reached. If there are more than one activities immerging from an event. The TL values for that event is taken as the minimum of the TL values among different activities. This is called ‘BACKWARD PASS’.
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