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.

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

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

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

The best kind of design isn't necessarily an object, a space, or a structure: it's a process- dynamic and adaptable.

And to get real work experience, you need a job, and most jobs will require you to have had either real work experience or a graduate degree.

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.