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.
Jakob NielsenOn average, when you ask someone to perform a task on a site, they cannot do it. It's not their fault; it's the designer's fault.
Jakob NielsenDeveloping fewer features allows you to conserve development resources and spend more time refining those features that users really need. Fewer features mean fewer things to confuse users, less risk of user errors, less description and documentation, and therefore simpler Help content. Removing any one feature automatically increases the usability of the remaining ones.
Jakob Nielsen