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Object-Oriented DevelopmentLife Cycle(OODLC)

John Wiley & Sons, ISBN 0471371378

Topic 2 Week 2 Object-Oriented Application Development

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1. The Life Cycle

2. The Object-Oriented Analysis Phase

3. The Object-Oriented Design Phase

4. The Construction Phase

5. The Object-Oriented Testing Phase

6. The Maintenance Phase

The Object-Oriented Development LifeCycle

(OODLC)

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The OODLC is

an update ofthe older SDLC

The Life Cycle

Phase

Analysis

Design

Construction

Testing

Maintenance

Activity

OOA

OOD

OOP

O-O Testing

All of the above

Models

Produced

RequirementsModel

Design versions of

the OO models

Actual system

Working system

All of the above

Components

Project scope

Feasibility study

Context diagram

Class diagram:

Entity classes

Interface classes

Control classes

Behavior diagrams:

Statechart diagrams

Collaborations and CRC cards

Sequence diagrams

Activity diagrams

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In Analysis we model the users requirements

For what the eventual system mustDO. Output of this process is a conceptual model

Consisting of 2 deliverables:

Requirements Model Object Model

The Object-Oriented Analysis Phase

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The Object-Oriented Analysis Phase

Requirements Model

The Requirements model has 5 components:

Project Scope

Context Diagram

Use Case Model

Interface DescriptionsFeasibility study

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The Project Scopeis a statement of what our project isto produce.

States in general terms what the system will do for the users.

May be a paragraph or many pages, depending on the size of theproject.

There is much variation in size and format amongcompanies and methodologies.

The Object-Oriented Analysis Phase

Requirements Model

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It is also important that the Scope says what the

system will notdo, Otherwise the users will try to push thescope

Which causes Scope Creep

(uncontrolled changes or continuous

growth in a projects scope).

The Object-Oriented Analysis Phase

Requirements Model

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The Context Diagram:

Shows our system as a large box, Surrounded by smaller boxes,

Representing External Entities:

ie., People, organizations, systems and other things outside our

system that either provide data to it or draw data from it.

The Object-Oriented Analysis Phase

Requirements Model

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The Object-Oriented Analysis Phase

Requirements Model

Context Diagram

Radio CHQT

Advertisers Database

System

Advertisers

Regulatory

Authorities

Revenue

Canada

Shareholders

ListenersBusiness

Bureau

Requests

Billing

Statistics &Reports

ProgramInfo Credit

Ratings

QuarterlyReports

FinancialReports

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A Use Caseis a script, A step-by-step description of how a user might make use of thesystem

To do a task.

It is a case of the usage of the system.

The Object-Oriented Analysis Phase

Use Case Model

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GUI (Abbreviated GUI(pronounced GOO-ee).A program interface that takes advantage of

the computer's graphics capabilities to make the programeasier to use.)

Other software interface Systems

Real-World systems that we control

Communications interfaces

etc.

The Object-Oriented Analysis Phase

Interface Descriptions

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Can we do this project? Shouldwe? Can we make it work?

Is the cost worth it?

etc.

The Object-Oriented Analysis Phase

Feasibility Analysis

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Modify Analysis model to reflect design decisions,

Mostly by adding information to the existing model. Add some new classes that do not directly model things in the real

world.

Result is a planof howthe system will do what theRequirements Analysis asks for

Object-Oriented Design Phase

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Analysisis whatthe systemmust do,

Designis howthe system willdo it.

Analysis VS Design

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Coding and testing

Should be done with an O-O language or database. Deployment and user training.

The Construction Phase

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First: unit testing of individual classes and programs Second: system testing.

Testing must be thorough and complete,

And automated.

Object-Oriented Testing Phase

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Bug fixes

Enhancements

Viruses

End-user computing

Backups and restores

Disaster preparedness and recovery The World Trade Center bombing.

Murphys Law: Anything that can go wrong will go wrong.

The Maintenance Phase

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References

Brown D.W, 2002,An Introduction to Object-Oriented Analysis;

Objects and UMLin Plain English, Wiley, USA.