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Shuttle Bus

It's called “feed-forward/work-back” because of the kinds of loops it inserts into the development process. When you get ahead of yourself, you feed information forward but don't do the work. This is a feed-forward loop. When you discover an oversight or failure from an earlier phase or activity, you do the necessary work immediately. This is a “work-back” loop. Feed ideas forward, work your way back. That's it. Whenever you get ahead of yourself, you make a note to yourself and your teammates to reconsider something when you get to the appropriate point in the process, wherever that is.

Just think of each phase or activity in the software development life cycle as having its own in-box. It doesn't matter what particular life cycle model you are using, how many activities it has, or even whether it is strictly sequential or loops back on itself. For each designated phase or step or activity you create a conceptual container, an “in-bin,” to hold things to be looked at and worked on at the appropriate time.


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