Page 134 - DCAP308_OBJECT_ORIENTED_ANALYSIS_AND_DESIGN

Object Oriented Analysis and Design

Notes Introduction

Domain model illustrates meaningful conceptual classes in a problem domain. It is a
representation of real-world concepts, not software components. It is not a set of diagrams
describing software classes, or software objects and their responsibilities. Its development entails
identifying a rich set of conceptual classes, and is at the heart of object oriented analysis. It is a
visual representation of the decomposition of a domain into individual conceptual classes or
objects. It is a visual dictionary of noteworthy abstractions.

OO domain analysis model contain class models, often state models, but seldom has an interaction
model. The goal is to analyze a problem without introducing bias for implementation. Business
experts should validate the analysis model. Analysis models can be used as an effective means
of communication among business experts and system design experts.

11.1 Domain Class Model

Domain class model perform following steps to construct domain class model

Find classes
Prepare data dictionary
Find association
Find attribute of objects & links
Combine classes using inheritance
Verify that access paths exits
Iterate & refine model

Reconsider the level of abstraction
Group classes into packages
11.1.1 Find Classes

Find classes for objects from application domain
All classes must make sense in application sense; avoid computer aspects only consider
physical entities.

Begin by listing classes found in problem statement, write down every classes that comes
to mind

Example: Let us see an example of ATM.
Figure 11.1: ATM Example

Source: http://svbitce2010.weebly.com/uploads/8/4/4/5/8445046/ch_11___12_system_conception_
domain_analysis.pdf

128 LOVELY PROFESSIONAL UNIVERSITY