It acts as a standard against which systems can be

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It acts as a standard against which systems can be evaluated OSI model is a layered model for communication systems
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©Ian Sommerville 2000 Software Engineering, 6th edition. Chapter 10 Slide 37 OSI reference model Application Presentation Session Transport Network Data link Physical 7 6 5 4 3 2 1 Communications medium Network Data link Physical Application Presentation Session Transport Network Data link Physical Application ©Ian Sommerville 2000 Software Engineering, 6th edition. Chapter 10 Slide 38 Architectural Styles Repository Client-Server Abstract Machine Model (Layered Model) Call-and-Return Model, Manager Model Event-Driven Model (Broadcasting, Interrupt- driven) Object Model Data Flow Model (Pipe Filter model) ©Ian Sommerville 2000 Software Engineering, 6th edition. Chapter 10 Slide 39 Key points The software architect is responsible for deriving a structural system model, a control model and a sub-system decomposition model Large systems rarely conform to a single architectural model System decomposition models include repository models, client-server models and abstract machine models Control models include centralised control and event-driven models ©Ian Sommerville 2000 Software Engineering, 6th edition. Chapter 10 Slide 40 Key points Modular decomposition models include data-flow and object models Domain specific architectural models are abstractions over an application domain. They may be constructed by abstracting from existing systems or may be idealised reference models
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