This session compares the architectural patterns of Model-View-Controller (MVC), Model-View-Presenter (MVP) and Model-View-View Model (MVVM). Each pattern creates testable, maintainable and reusable application components, however, there are differences that suit each approach to specific types of developer tooling. The presentation first looks at the basic theory and differences between the approaches; then uses demos that show how each apply to Microsoft ASP.NET, Microsoft Silverlight/Windows Presentation Foundation (WPF) and Microsoft SharePoint developer application projects.