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ZEIT2301 Design of Information Systems Unified Modelling Language

This document explores the significance of modeling in system design, emphasizing the United Modeling Language (UML) as a key tool. It serves as a refresher on UML and object-oriented approaches to software development, outlining the benefits of creating models prior to coding. Models provide a common vocabulary, facilitate communication among stakeholders, and help document requirements. The document analyzes structure and behavior diagrams in UML, highlighting their roles in representing data relationships and dynamic behaviors in software systems, essential for effective system design.

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ZEIT2301 Design of Information Systems Unified Modelling Language

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  1. ZEIT2301Design of Information SystemsUnified Modelling Language School of Engineering and Information Technology UNSW@ADFA Dr Kathryn Merrick

  2. Topic 03: Models and System Design • Objectives • To consider the role of modelling in system design and development. • Refresh knowledge of UML and object-oriented approach to systems development References Text: Ch 5

  3. The role of modelling in software development • “Modellingis the designing of software applications before coding. Modelling is an essential part of large software projects, and helpful to medium and even small projects as well. A model plays the analogous role in software development that blueprints and other plans (site maps, elevations, physical models) play in the building of a skyscraper.” • OMG (Object Modelling Group) http://www.omg.org/gettingstarted/what_is_uml.htm

  4. Why create models? • Modelling should be a dynamic process • Bring together developers, users and stakeholders • Spur refinement and expansion of requirements • Document what was done for future reference • Promote informal training • Model development tools • Simple implements such as pencil and paper • Sophisticated tools such as CASE

  5. Unified Modelling Language • Provides a common vocabulary of object-oriented terms and diagramming techniques rich enough to model any systems development project from analysis through to implementation • Version 2.0 has 14 diagrams in 2 major groups: • Structure diagrams • Behaviour diagrams

  6. UML Structure Diagrams • Represent the data and static relationships in an information system • Class • Object • Package • Deployment • Component • Composite structure

  7. UML Behaviour Diagrams Depict the dynamic relationships among the instances or objects that represent the business information system • Activity • Sequence • Communication • Interaction Overview • Timing • Behavioural State Machine • Protocol State Machine • Use case

  8. UML 2.0 Diagram Summary

  9. UML and development methodologies • UML is not a development methodology. It is a set of notations and diagrams for modelling a system. • Various methodologies, some proprietary, use UML. • The Unified Process (UP) for example is an object-oriented system development methodology which uses UML for modelling.

  10. Benefits of the Object Approach

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