Before you download any random file, understand this: Norman’s work fundamentally changed how we build technology. In the past, designers focused solely on usability (Is it easy to use?). Norman argued that emotion is more critical than utility. A beautiful product that is hard to use will be forgiven. An ugly product that works perfectly will be rejected.

To apply Norman’s theory:

If you are a digital designer looking for the PDF to improve your apps, here is the translation:

Norman proposes that design can be evaluated on three levels: