3.1 Systems, Languages, and Models3.2 Models3.3 Languages3.4 Formalization Principles3.5 The Power of Modeling3.6 Models and Semantics3.7 The Different Types of Model3.8 Models and Diagrams3.9 System and Viewpoints3.10 Interface Design and Management3.11 Modeling Standards and Tools3.12 Modeling Requirements3.13 ConclusionAnswersReferences