4. Launch
The purpose of the launch phase is to prepare the website for public viewing. This requires final polishing of design elements, deep testing of interactivity and features and, most of all, a consideration of the user experience. An important early step in this phase is to move the website, if need be, to its permanent Web server. Testing in the production environment is important because different servers can have different features and unexpected behavior (e.g. different database host addresses).