17) It’s Not Just the Public Site
Many sites have an administration area for managing content, viewing registered user profiles, resetting passwords etc. This may not be viewed by many people but it is still important. Sometimes it can contain data that is not publicly available (such as a user account enable button). This is important information to developers when designing the database.
via thinkvitamin.com - Something that I know often gets left to the last minute but the admin side is so important for client satisfaction.