As a user experience designers we are regularly in situations where our design decisions will make significant effect on the end users of the web site, application or generally any user interface or service we design. Apart from the need to understand business case and idea – probably the most important is to understand who are users of our interfaces?

Read the complete post at http://www.uxpassion.com/2010/06/user-interface-design-beginners-intermediates-experts/