Criteria for Inclusion Sites in this collection are selected based on the relevancy, quality, and currency of the contents, and the navigability and ease of use of the site's design. Sites included should have an identifiable content authority and be reliably accessible. 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.