Project Constraints and the Longest Path

If you want to optimize your schedule it is advantageous to look to shorten activities that are along the critical path. But what do you do if you have a project constraint that causes your scheduling software to either display multiple critical paths or completely obscure the true critical path?

It is generally stated that an activity is critical if it cannot be delayed without impacting the schedule end date. Well, there are exceptions to every rule. And in this case the exception is that the activity may not be delayed without affecting an activity constraint date, such as a ‘Finish On or Before’ constraint date. Here the critical activity is not causing the project end date to slip, but an interim activity constraint date.

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