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QUALITY ASSURANCE

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Quality

Quality is defined as excellence or fitness. Perfect quality is very costly

and virtually impossible. Quality should be within acceptable limits as

defined by the organization The totality of features and characteristics

of a product or service that bear on its ability to satisfy specified or

implied needs .For the producer quality is conformance to

specifications and absence of variation from specs .For the customer

quality is physical quality, quality of service, psychologicalquality

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Quality characteristics in information system

Complete dataAccurate data

Precise data

Understandable output

Timely output

Relevant output

Meaningful output

User friendly operation

Error resistant operations

Authorized useProtected system and operations

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Software Quality Criteria:

correctnessefficiency

flexibilityintegrityinteroperability

maintainabilityportability

reusability

testabilityusability

Reliability

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Software quality assurance

It can be defined as a set of

systematic activities providing

evidence of the ability of thesoftware process to produce a

software product that is fit to use

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For a quality information system

data

information

system

Model

method

process

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Organizational functions for quality assurance

Top management information system

quality assurance

Information systems executive qualityassurance

User quality assurance

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Quality assurance for application:

Quality assurance in application development

Application design for quality

Maintenance of application quality

Post audit evaluation of information system

applications

Maintenance of Data quality

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Quality assurance in application development

The development cycle is designed to support qualityassurance in terms of developing a system thatmeets requirements.

Development quality assurance procedures can be

operated in Cooperative mode

Eg; structured walk through for programmers

Adversary mode

Or a combination

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Application design for quality

Application designed with high regard for quality

assurance in operation tend to have low error rates

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Maintenance of application quality

It refers to either repairs of errors or enhancements.

If repairs are not made user may loose theconfidence in it. If enhancements are not made,

users may switch to alternatives. The Maintenance

process cycle includes

Identification

Analysis

Performing change Testing

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Maintenance of Data quality

Maintenance of Data quality includes continous

inputs of resources, the ability of an organization to

maintain data quality depends on bothorganizational factors and data factors

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Post audit evaluation of information system

applications

It is a review by the task group. It reviews the

objectives and cost benefit representations made on

behalf of the project and compares them with

Actual performance and actual costs

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THANK YOU