Defines the psychology of human-computer interaction, showing how to span the gap between science & application. Studies the behavior of users in interacting with computer systems.
A classic in the field of usability, it is the pinnacle of formal psychologically based usability- much as programming was once a sub-field of mathematics. Good or bad, the usability world has become an entity to and of itself, but everyone doing usability would greatly enrich their understanding by picking up this book.