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Chapter 4

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gSelection Of An Appropriate

Project Approach

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CHOOSING TECHNOLOGIES The development of software in-house

suggests that the project has certain characteristics: the project team and the users belong to

the same organization; the project being considered slot into a

portfolio of existing computer-based system;

the methodologies and technologies to be used are not selected by the project manager, but are dictated by local standards.

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An outcome of project analysis will be the selection of the most appropriate methodologies and technologies.

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Methodologies

Waterfall Method V-process Model RAD Spiral Model

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Waterfall Method

Also known as the Traditional method There is a sequence of activities

working from top to bottom.

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Waterfall Method (con’t)

Advantages: Shorter development time Cost possible

Drawbacks: System limitations not being discovered

until later in the development cycle Clients not being able to see the

product until its is completely finished.

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Feasibility study

User requirements

Analysis

System design

Program design

coding

Testing

operation

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V-process Model

The V-process can be seen as expanding the testing activities in the waterfall model.

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Feasibility study

User requirements

System design

Program design

Code

Program testng

System testing

User acceptance

Review Corrections

Corrections

Corrections

Corrections

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V-Process Method (con’t)

Advantages: Customer more satisfaction Increased quality

Drawbacks: More time More resources

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RAPID APPLICATION DEVELOPMENT Customers of IT are concerned with

getting working business applications delivered quickly and at less cost.

A response to this has been Rapid Application Development (RAD).

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Business Modeling

Data Modeling

Process Modeling

Application Generation

Testing and

Turnover

Team #1

Business Modeling

Data Modeling

Process Modeling

Application Generation

Testing and

Turnover

Team #2

Business Modeling

Data Modeling

Process Modeling

Application Generation

Testing and

Turnover

Team #3

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RAD (con’t)

Advantages: Increased speed of development Increased quality

Drawbacks: Reduced scalability Reduced feature Need more resources

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Spiral Model

Is a software development process combining elements of both design and prototyping in stages.

Risk analysis

Engineering-Design

Construction

Planning

Customer Communication

Customer Evaluation

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Spiral (con’t)

Advantages: Increased quality Less risks

Drawbacks: Complexity It is a new model