There are three primary reasons: ignorance about users, a conflict of interest between serving human needs and construction priorities, and the lack of a process for understanding human needs as an aid to developing appropriate product form and behavior.

• 这里有3个主要原因，即不了解用户、满足用户需求与产品开发之间存在利益冲突，以及缺乏一种设计过程，这个过程能够认识到人类的需要可以有助于开发出恰当的产品形式和行为。