IT-Modell Allgemein / By / 29. December 2007 3-Layer-Architecture Figure 8: 3-Layer-Architecture Business and User Model Interfaces Figure 9: Business- and User Model Interfaces Class Model of the UI layer Figure 10: Class Model of the Business Layer Class Model of Business Layer Figure 11: Class Model of the Business Layer Class Modell of Business- and Data Layer Figure 12: Class Model of Business- and Data Layer Class Modell of Data Layer Figure 13: Class Modell of Data Layer Sequence Diagram of XMSS-Element “Simulation” Figure 15: Sequence Diagram of the XMSS-Element “Simulation” Deployment Model Figure 14: XMSS Deployment Model