Software Engineering - Old Questions
1. Explain system modeling with suitable example.
System modeling is the process of developing abstract models of a system, with each model presenting a different view or perspective of that system. It is about representing a system using some kind of graphical notation, such as Unified Modeling Language (UML). Models help the analyst to understand the functionality of the system; they are used to communicate with customers.
Models can explain the system from different perspectives:
- An external perspective, where we model the context or environment of the system.
- An interaction perspective, where we model the interactions between a system and its environment, or between the components of a system.
- A structural perspective, where we model the organization of a system or the structure of the data that is processed by the system.
- A behavioral perspective, where we model the dynamic behavior of the system and how it responds to events.
Five types of UML diagrams that are the most useful for system modeling:
- Activity diagrams, which show the activities involved in a process or in data processing.
- Use case diagrams, which show the interactions between a system and its environment.
- Sequence diagrams, which show interactions between actors and the system and between system components.
- Class diagrams, which show the object classes in the system and the associations between these classes.
- State diagrams, which show how the system reacts to internal and external events.