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ALTERNATIVESYSTEM-BUILDING

APPROACHES

By Arun Mishra

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Prototyping Process of building experimental system quickly

and inexpensively for demonstration and

evaluation

Prototype Preliminary working version of information

system for demonstration and evaluation

Iterative

A process of repeating over and over again the

steps to build system

ALTERNATIVE SYSTEM-BUILDING

APPROACHES: Prototyping

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The Prototyping Processes

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1. Identifying users basic requirements

2. Developing initial prototype

3. Using prototype

4. Revising and enhancing prototype

Steps in Prototyping

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Advantage Useful in designing information systems

end-user interface

Disadvantage

Rapid prototyping can gloss over essential

steps in systems development

Advantages and Disadvantages of

Prototyping

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Application software packages Set of prewritten, precoded application software

programs commercially available for sale or

lease

Customization Modification of software package to meet

organizations unique requirements without

destroying the softwares integrity

ALTERNATIVE SYSTEM-BUILDING

APPROACHES: Application Software

Packages

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Development of information systems by end

users with little or no formal assistance from

technical specialists

Allows users to specify their own businessneeds

ALTERNATIVE SYSTEM-BUILDING

APPROACHES: End-User Development

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End-User Versus System Lifecycle

Development

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Improves requirements gathering leading to

higher level of user involvement and

satisfaction

Cannot easily handle processing of largenumbers of transactions or applications

ALTERNATIVE SYSTEM-BUILDING

APPROACHES: End-User Development

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Approach for software development

De-emphasizes procedures

Shifts focus from modeling business

processes and data to combining data and

procedures to create objects

Object-Oriented Software Development

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Rapid application development (RAD), is fast way

of developing software.

Process for developing systems in short time

period

Uses prototyping, fourth-generation tools, and

close teamwork

Steps involves in the RAD process: Business modelling

Data modelling

Process modelling

Application development

Rapid Application Development (RAD)

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Limitations of RAD approach

For large software projects a huge requirement ofhuman resources will have to be met to ensureRAD development.

If customers and developers do not cooperate witheach other then RAD process will fail to deliver thesoftware with in the time and cost.

Some applications do not lend themselves tomodularized treatment. Such applications are notsuitable for RAD development.

RAD is not suitable for technically challengingapplications that require taking technical risks.

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