The developmental stage is the point where the web site itself is created. At this time, your web designer will take all of the individual graphic elements from the prototype and use them to create the actual, functional site.
This is typically done by first developing the home page, followed by a “shell” for the interior pages. The shell serves as a template for the content pages of your site, as it contains the main navigational structure for the web site. Once the shell has been created, your designer will take your content and distribute it throughout the site, in the appropriate areas.
About a year ago, I wrote an article for the main site that outlines The 6 Phases of the Web Site Design & Development Process. As part of my business web site, the article is slanted to how I personally help clients through the process of creating a web site.