The Design of Everyday Things

Two of the most important characteristics of good design are discoverability and understanding.

industrial designers emphasizing form and material, interactive designers emphasizing understandability and usability, and experience designers emphasizing the emotional impact.

Affordances determine what actions are possible. Signifiers communicate where the action should take place. We need both.

Design is concerned with how things work, how they are controlled, and the nature of the interaction between people and technology.

Two of the most important characteristics of good design are discoverability and understanding.

So we must design our machines on the assumption that people will make errors.