The design process is not well understood either psychologically or practically. This is not for lack of study. Many designers have reflected on their own processes. One motivation for study is the wide gaps, in every design discipline, between best practice and average practice, and between average practice and semi-competent practice. Much of design cost, often as much as a third, is rework, the correction of mistakes. Mediocre design provably wastes the world’s resources, corrupts the environment, affects international competitiveness. Design is important; teaching design is important.
