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Information Systems Modelling and Design

with

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Objectives

• Getting acquaint with the visual modelling language UML (Unified Modelling Language)

• Able to design an information system using UML

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Study matter

• Books: Fowler & Scott: UML distilled 2nd ed Booch, Rumbauch & Jacobson: The

Unified Modeling Language – User Guide

• Web: www.omg.org www.popkin.com

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UML? 1

• UML is the successor to the wave of object-oriented analysis and design (OOA&D) methods. The methods of Booch, Rumbaugh and Jacobson (de 3 amigo’s) are merged. UML represents the culmination of best practices in practical object-oriented modelling.

• UML offers a standard way to write a system’s blueprints, including conceptual things such as business processes and system functions as well as database schemas.

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UML? 2

• UML is a modelling language, a notation used to express and document designs.

• UML proposes a standard for technical exchange of models and designs.

• UML also defines a “meta-model”, a diagram that defines the syntax of the UML notation

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UML Model Views• Use Case Modelling

• Requirements • Use Case diagrams

• Structural Modelling• Static structure diagrams

• Class diagrams• Object diagrams

• Behaviour Modelling• State diagrams• Interaction diagrams

• Sequence diagrams• Collaboration diagrams

• Activity diagrams

• Implementation diagrams

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UML: what we will cover

• Use cases• Documenting the system’s behaviour from

the user’s viewpoint, requirements capture

• Class diagrams• Describing the type of objects in a system

and the static relationships between them

• Activity diagrams• Describing the sequencing of activities with

support for both conditional and parallel behaviour

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Relationship between diagrams

Use Casediagram Class diagram

Businessrules

in OCLInteractiondiagram

Class diagramwith OCL and

operations

State diagram

Activity diagram

CompleteClass diagram

Functionalrequirements:

Behaviour

Domainknowledge:Structure

provide infromation

may have influence on

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UML steps

1. Examine the necessities of the information system use cases

2. Object-oriented domain analysis decomposition of the problem field in concepts, attributes and associations that may be of relevance to the information system

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End of Intro