The Model-View-View-Model (MVVM) pattern is held in high regard by many developers as an excellent way of creating sophisticated modern applications. It's clear seperation of presentation and business logic produces a clean implementation that promotes speed, scalability and code reuse in applications with a complex UI. These strengths have found it favor with WPF and Silverlight developers. It is now increasingly being employed for Windows 8 apps, a purpose to which it is ideally suited as this book will show. In this brief, information-rich, guide we will show you how MVVM works with both XAML (C#) and HTML5 (JavaScript) flavors of Windows 8. Beginning with a brief recap of MVVM concepts under .NET - to provide a common frame of reference - we will then delve into the details of how MVVM can best be implemented in Metro-style apps for Windows 8 and show a working application framework in each case. What you'll learn * How the MVVM pattern can bring elegance, power, speed and reusability to your Windows 8 apps. * That MVVM implementations under Windows 8 differ from MVVM implementations under .NET. * Produce fully working Metro-style applications using XAML and HTML5 * How you can use the popular KnockoutJS Framework to speed the development of your HTML5 Metro apps. * Essential tips, tricks and cautions that will allow you to bring your existing .NET skills to bear quickly in the Windows 8 world. Who this book is for This is a fast-paced guide for developers comfortable with both .NET programming and the fundamentals of Windows 8 development. Table of Contents * Setting up Windows 8 Application Project * Implementing the View * Implementing the Model * Implementing the ViewModel * HTML5, JavaScript, and Windows 8 Applications * View, Model and ViewModel Structures in HTML5 and JavaScript