Inadequate use of usability engineering methods in software development projects have been estimated to cost the US economy about $30 billion per year in lost productivity.

Windows '98 is so similar to Windows '95 because Apple hasn't invented anything worth copying since 1995.

People have to want to change before there's any chance of helping them do so.

A general principle for all user interface design is to go through all of your design elements and remove them one at a time.

On the Internet, it's survival of the easiest.... Give users a good experience and they're apt to turn into frequent and loyal customers. But ... it's easy to turn to another supplier in the face of even a minor hiccup. Only if a site is extremely easy to use will anybody bother staying around.

Users spend most of their time on other sites. This means that users prefer your site to work the same way as all the other sites they already know.

Users are not designers.