"It comes up very early in any ASP.NET MVC application: duplicated HTML. Bits and pieces of final rendered page may appear on two or more different pages, and that’s duplication we would like to eliminate. In WebForms land, we had quite a few options to consolidate and refactor that common HTML: Master Pages, custom controls, user controls, composite controls and so on. In ASP.NET MVC, the potential for duplicate HTML is still close to a guarantee, so we’ll need to explore different options for common HTML. This time around, our options are a little more straightforward than in WebForms land."