Transcript DIS Topic 02: Project Initiation

ZEIT2301
Design of Information Systems
Unified Modelling Language
School of Engineering and Information Technology
UNSW@ADFA
Dr Kathryn Merrick
Topic 03: Models and System Design
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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
The role of modelling in software
development
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“Modelling is 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
Why create models?
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Modelling should be a dynamic process
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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
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Simple implements such as pencil and paper
Sophisticated tools such as CASE
Unified Modelling Language
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Provides a common vocabulary of object-oriented terms
and diagramming techniques rich enough to model any
systems development project from analysis through to
implementation
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Version 2.0 has 14 diagrams in 2 major groups:
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Structure diagrams
Behaviour diagrams
UML Structure Diagrams
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Represent the data and static relationships in an
information system
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Class
Object
Package
Deployment
Component
Composite structure
UML Behaviour Diagrams
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Depict the dynamic relationships among the instances or
objects that represent the business information system
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Activity
Sequence
Communication
Interaction Overview
Timing
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Behavioural State Machine
Protocol State Machine
Use case
UML 2.0 Diagram Summary
UML and development
methodologies
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UML is not a development methodology. It is a set of
notations and diagrams for modelling a system.
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Various methodologies, some proprietary, use UML.
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The Unified Process (UP) for example is an objectoriented system development methodology which uses
UML for modelling.
Benefits of the Object Approach