User Interface Design
A well designed user interface encompasses four distinct, yet related constructs: usability, visualization, functionality and accessibility. The interface design has to be usable or, in other words, how intuitively or easily it allows your visitors to navigate and perform common actions. The user interface has to be visually interesting and aesthetically pleasing while avoiding potentially distracting or unnecessary elements. It has to be functional, which refers to the features of your site and how useful they are for supporting the site's purpose. And finally, the web user interface has to be accessible also to users with certain disabilities.
