It is relatively easy to design for the perfect cases, when everything goes right, or when all the information required is available in proper format

Simplicity design axiom: The complexity of the information appliance is that of the task, not the tool. The technology is invisible.

Beauty and brains, pleasure and usability - they should go hand in hand.

The argument is not between adding features and simplicity, between adding capability and usability. The real issue is about design: designing things that have the power required for the job while maintaining understandabili ty, the feeling of control, and the pleasure of accomplishment.

The designer shouldn't think of a simple dichotomy between errors and correct behavior; rather, the entire interaction should be treated as a cooperative endeavor between person and machine, one in which misconceptions can arise on either side.

When you have trouble with things—whether it's figuring out whether to push or pull a door or the arbitrary vagaries of the modern computer and electronics industries—it's not your fault. Don't blame yourself: blame the designer.

Learning should take place when it is needed, when the learner is interested, not according to some arbitrary, fixed schedule