The Model-View-View Model pattern is a common denominator between applications using XAML to create the user interface. First applied in WPF, it was then easily ported to Silverlight and Windows Phone development. With WinRT and the Metro-style applications, XAML is now a first-class citizen for native Windows 8 development. Here too, the MVVM pattern is making developers' life easier, and proven components can be used to simplify and speed up application development. In this session, Laurent Bugnion, the creator of the acclaimed MVVM Light Toolkit, will present best practices around XAML-based Windows 8 application development, and how to leverage code and skills in Windows 8 too.