Allan Shalloway asked Don Reinertsen about the predictability of software development processes and the use of feedback. Quite a sophisticated response if you're interested in this sort of thing.
The gist of it:
I do not believe that there are two triads: defined process, fully-determined output, use no feedback; and undefined process, unpredictable output, use feedback. I consider it more useful to treat these attributes as three distinct dimensions:
1. The degree of process definition.
2. The randomness of its output.
3. The amount of feedback that the process uses.
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