“adults forget how difficult that task was.”

“Could we ever switch to this or any of the many other rational systems? Unlikely: tradition is difficult to overcome.”

“Forget the complaints against complexity; instead, complain about confusion.”

“Principles of design:1. Use both knowledge in the world and knowledge in the head.2. Simplify the structure of tasks.3. Make things visible: bridge gulfs between Execution and Evaluation.4. Get the mappings right.5. Exploit the power of constraints.6. Design for error.7. When all else fails, standardize.”

“What makes something simple or complex? It's not the number of dials or controls or how many features it has: It is whether the person using the device has a good conceptual model of how it operates.”

“Simplification is as much in the mind as it is in the device.”

“Design is really an act of communication, which means having a deep understanding of the person with whom the designer is communicating.”