Architecture descriptions are formal descriptions of an information system, organized in a way that supports reasoning about the structural and behavioral properties of the system and its evolution. They define the components or building blocks that make up the overall information system, and provide a plan from which products can be procured, and subsystems developed, that will work together to implement the overall system. It thus enables you to manage your overall IT investment in a way that meets the needs of your business. To provide a uniform representation for such architecture descriptions, the ArchiMate enterprise architecture modeling language has been developed. It offers an integrated architectural approach that describes and visualizes the different architecture domains and their underlying relations and dependencies. In a short time, ArchiMate has become the open standard for architecture modeling in the Netherlands, it is also fairly well known in the international enterprise architecture community, and recently it has been brought under the aegis of The Open Group.