ATM explain and its context modeling.pptx
- 2. Context Models: Context models are used to illustrate the operational context of a system. They show what lies outside the system boundaries. They shows how IT applications fit into the context of the people and the organization they serve. Context models are sometimes called enterprise architecture models, sometimes high-level design models and sometimes conceptual models. Context Models
- 3. They simply show other system in environment, not how the system being developed in that environment. Producing an architectural model is first step in context modeling. Social and organizational concerns may affect the decision on where to position system boundaries Context Models
- 4. System Context Diagram • A System Context Diagram (SCD) in software engineering and systems engineering is a diagram that defines the boundary between the system, or part of a system, and its environment, showing the entities that interact with it. • This diagram is a high level view of a system.
- 5. Automated-teller Machine(ATM) 5 COMP201 - Software Engineering It illustrates the structure of information system that include a bank auto-teller network. Each ATM is connected to • Account database • Local branch accounting system • Security system • Maintenance system to support machine maintenance. • Usage database that monitor how the network of ATM is used • local branch counter system provide services such as backup and printing.
- 6. Example – Context models of an ATM System Auto-teller system Security system Maintenance system Account database Usage database Branch accounting system Branch counter system 6 COMP201 - Software Engineering
- 7. Context models normally show that the environment includes several other automated systems. However, they do not show the types of relationships between the systems in the environment and the system that is being specified. Therefore, simple context models are used along with other models, such as business process models. These describe human and automated processes in which particular software systems are used. Context models of an ATM System
- 8. Example - Order Processing Data Flow Diagram Complete order form Order details + blank order form Validate order Record order Send to supplier Adjust available budget Budget file Orders file Completed order form Signed order form Signed order form Checked and signed order + order notification Order amount + account details Signed order form Order details
- 9. References COMP201 - Software Engineering 9