A search engine or other form of index to the site's contents is desirable. Site loads easily. Site isn't often overloaded or unavailable. Site is open to all without fees. Site instructions are clear and placed before links.
Site links work properly.
Site works intuitively. Site layout ensures user always know where they are. Site encourages appropriate and safe user interaction. Site titles and headings are clear, descriptive, and appropriate for intended audience. Site content is of adequate scope and is organized to meet needs of intended audience.