The Contracts API in Windows 8 offers applications the capability to integrate nicely with the operating system. In the current release, there are 5 contracts that we as developer can work with. The goal of this course is teaching how we can write our applications so that we make maximum use of the contracts. Contracts are expected by the user to be working in almost every application. It's a vital part that every Windows 8 developer should understand and apply in his projects. Next to Contracts, this course also explores some of the available extensions.