If I had not studied music, there would be no Macintosh computers today.

A computer shall not harm your work or, through inaction, allow your work to come to harm.

Imagine if every Thursday your shoes exploded if you tied them the usual way. This happens to us all the time with computers, and nobody thinks of complaining.

As far as the customer is concerned, the interface is the product.

A well-designed and humane interface does not have to be split into beginner and expert subsystems.

What users want is convenience and results.

Once the product's task is known, design the interface first; then implement to the interface design.