Deciding what to design

We Don’t Really Know the Goal When We Start

The most serious model shortcoming is that the designer often has a vague, incompletely specified goal, or primary objective. In such cases, the hardest part of design is deciding what to design.

I came to realize that the most useful service I was performing for my client was helping him decide what he really wanted.

Today, we recognize that rapid prototyping is an essential tool for formulating precise requirements. Not only is the design process iterative; the design-goal-setting process is itself iterative. Knowing complete product requirements up front is a quite rare exception, not the norm. Therefore, goal iteration must be considered an inherent part of the design process.

  1. ​What's wrong with the rational model​