An enterprise architecture tries to describe and control an organization's structure, processes, applications, systems and techniques in an integrated manner?. Clear specifications and descriptions of components and their relationships in such architecture requires a coherent architecture modeling language. Lankhorst and his co-authors present such as business modeling language that captures the complexity of domain architectures and their relations and allows the construction of integrated enterprise architecture models. to? to-be?, the authors also describe analysis methods to assess both the qualitative impact of changes in architecture and quantitative aspects of architecture, such as performance and cost issues.