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I agree with Heather’s comments. Backwards scheduling and as late as possible add risk because your are telling the tool to schedule each task to start at the last possible moment without impacting the constraint date in the middle of your schedule (or project end). So rather than saying Bob can start task A now because he’s available and all predecessors have been met, the tool may tell Bob not to start task A until 2-3 weeks from now, effectively eliminating all available slack.
I think the driving question is what you as the PM are trying to achieve.
Are you simply trying to find out the latest possible project start date. If that’s the case, use the backwards scheduling/as late as possible technique to determine the latest possible start date. Once that’s determined schedule and manage the project as normal using forward pass/as soon as possible.
If you’re trying to figure out where the constraint date should be set, you can follow Heather’s comments, and the critical path will tell you where to set the milestone constraint date. You can also experiment with changing project start dates and rescheduling to determine a latest possible start date.
If you plan to manage the schedule with the backward pass/as late as possible configuration, be aware of the risks introduced and understand that every task is now scheduled to start at the last possible moment and there will be basically zero slack.