“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.”

“Any time you see signs or labels added to a device, it is an indication of bad design: a simple lock should not require instructions.”

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

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

“adults forget how difficult that task was.”

“Designers know too much about their product to be objective judges: the features they have come to love and prefer may not be understood or preferred by the future customers.”

“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.”