A bad website is like a grumpy salesperson.

Consistency is one of the most powerful usability principles: when things always behave the same, users don't have to worry about what will happen. Instead, they know what will happen based on earlier experience.

Usability rules the web. Simply stated, if the customer can't find a product, then he or she will not buy it.

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.

The usability tests we have conducted during the last year have shown an increasing reluctance among users to accept innovations in Web design. The prevailing attitude is to request designs that are similar to everything else people see on the Web.

The web is the ultimate customer-empowering environment. He or she who clicks the mouse gets to decide everything. It is so easy to go elsewhere; all the competitors in the world are but a mouseclick away.

Progressive disclosure defers advanced or rarely used features to a secondary screen, making applications easier to learn and less error-prone.