Over the past several years, I have taken an interest in usability and web design. One of the areas that seems to be often overlooked when it comes to design of a site is the design of the URIs on that site. Modern CMS systems allow for varying degrees of URI customization, but the defaults are often not as usable as they could be, and URIs are often placed last in the design process.
Clean URIs are one component of a clean website, and it is an important one. The majority of end-user access to the Internet involves a URI, and whether or not the user actually enters the URI, they are working with one nonetheless.
First, I would like to talk about the guiding principles behind URI design, then talk about the practical implementation of the principles.