Let's compare and contrast the RAT (Rework Avoidance Theory) model of software development with the CHT (Change Harvester Theory) model. The differences are multiple and pronounced, so this may take us a while. I want to talk not so much about the theories today, as about the working models they underpin and lead to. Those models are a kind of inner core of making software, shaping our activities of course, but also our solutions, and even the problems. The RAT model sees software development as an off-line program-construction activity composed of these parts: defining, decomposing, estimating, implementing, assembling, and finishing. We'll get to the parts in a second, but the CHT model's lead-in statement is already markedly different. The CHT model sees software development as an interactive and on-line program-alteration activity.

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