Types of models and modeling approaches

There are several different approaches that you can take to designing systems and software applications by using models. The approach you take and the models that you choose to create depend on the specific domain you are working in and the nature of the problem that you are trying to solve.

Use-case models
Use-case models provide detailed information about the behaviors of the system or software application that you are developing. Use-case diagrams depict the relationships between the uses cases and actors, and activity diagrams describe the flow of objects and control in each identified behavior.
The analysis model
The analysis model describes the structure of the system or application that you are modeling. It consists of class diagrams and sequence diagrams that describe the logical implementation of the functional requirements that you identified in the use case model.
The design model
The design model builds on the analysis model by describing, in greater detail, the structure of the system and how the system will be implemented. Classes that were identified in the analysis model are refined to include the implementation constructs.
Design contract management protocols
Design contract management protocols, or DCMP, address the capture and design of formal requirements, ensure automation through repeatability and enforcement, and promote governance. Using different design contract management protocols provides different levels of management and control of the model and the system. The choice of protocol also depends on the work environment, time and required architectural control of the software development process.

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