Page 85 - DCAP308_OBJECT_ORIENTED_ANALYSIS_AND_DESIGN

Anil Sharma, Lovely Professional University
Unit 7: Interaction Modelling

Unit 7: Interaction Modelling Notes

CONTENTS
Objectives

Introduction
7.1 Use Case Models
7.1.1 Use Case Concept

7.1.2 Basic Model Elements
7.1.3 Use Case Diagrams
7.2 Sequence Models
7.2.1 Basic Sequence Diagram Symbols and Notations

7.3 Activity Models
7.3.1 Basic Activity Diagram Symbols and Notations

7.4 Summary
7.5 Keywords
7.6 Review Questions
7.7 Further Readings

Objectives

After studying this unit, you will be able to:
Describe the concept of use case models
Discuss the basic use case model elements

Explain the concept of sequence models
Analyse the concept of activity models

Introduction

Interaction diagrams are those diagrams that explain the way of getting the job done by
collaboration of groups of object. These diagrams take into custody the behaviour of a single use
case, presentation the pattern of interaction among objects. Interaction diagrams describe how
groups of objects collaborate to get the job done. Interaction diagrams capture the behavior of a
single use case, showing the pattern of interaction among objects. The purpose of Interaction
diagrams is to model interactions between objects, assist in understanding how a system (a use
case) actually works, verify that a use case description can be supported by the existing classes
Identify responsibilities/operations and assign them to classes. These allow you to work out
how your classes can help the user solve problems. Sequence diagrams make the timing of
various operations clear.

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