quality:correction, information:classification, structural:summarization, stylistic:style_transfer
Rational model

The rational model was independently developed by Herbert A. Simon, an American scientist, and two German engineering design theorists, Gerhard Pahl and Wolfgang Beitz. It posits that:

The rational model is based on a rationalist philosophy and underlies the waterfall model, systems development life cycle, and much of the engineering design literature. According to the rationalist philosophy, design is informed by research and knowledge in a predictable and controlled manner.

Typical stages consistent with the rational model include the following:

Each stage has many associated best practices.