Mockups are scaled models of the pages for a Web site. A mockup is not fully functional, but gives the client a basic idea of how their site will look and feel. The layout can be tested to evaluate which functions work better than others and which conflict with the overall operation before the code is written. It may not have all the bells and whistles of a polished, completed and working interactive design; however, it lets the client and web design staff work together to tailor the pages rather than make costly changes after it is up and running.