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To build great compelling, responsive, secure smart client applications with WPF you need to master not just the basic building blocks of WPF but how to compose the rest of the application that sits behind the façade of the user interface. You need to understand user interface presentation patterns to have good separation between your UI definition and the supporting logic code. You need to have loose coupling between different pieces of functionality in your application so they can be independently developed, maintained, tested, and deployed. You need to be able to communicate between the loosely coupled parts of your application with events and commands. You need to secure the application, collect credentials from the user, authenticate them, authorize actions and authenticate against remote services, databases, and other external resources. You need to manage concurrent and asynchronous work in the client and deal with the threading issues of the UI context. You need to retrieve and update data, even cache it locally for offline use, and synchronize that data when you go back online. You also need to make calls to services and be notified on events outside of your application, such as changes to back end data. And finally, you have to deploy your application.