UNIT-VI Product Metrix

8/12/2019 UNIT-VI Product Metrix

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Points covered :

What is metrics

Challenges of product metrics

Measurement principles

Software metrics and Qualities

McCalls Factors

ISO 9128 Standards

PRODUCT METRICS


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WHY SOFTWARE METRICS???

To characterize.

To evaluate.

To predict.

To improve.


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Characterize-

To gain understanding of processes, products, resources, and environments

Evaluate

To determine status with respect to plans

Predict

To plan

To Improve


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MEASUREMENT METRIC AND INDICATOR

Measurement is the act of determining a measure.

The IEEE Standard Glossary of Software Engineering Terms [IEE93] definesmetric as

a quantitative measure of the degree to which a system, component,

or process possesses a given attribute.

An indicator is a metric or combination of metrics that provide insight into the

software process, a software project, or the product itself


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MEASUREMENT PRINCIPLES

Formulation : the derivation of software measures and metrics

appropriate for representation of software

Collection : mechanism used to accumulate data required to

derive the formulated metrics Analysis : the computation of metrics and the application of

mathematical tools

Feedback : recommendations derived from interpretations of

product metrics transmitted to the software team


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METRICS CHARACTERIZATION AND VALIDATION

Should have desirable mathematical properties

The value of the metrics should vary as per thetraits

Metrics should be validated empirically in a wide

range of context before being published or usedto make decisions


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GOAL-ORIENTED SOFTWARE MEASUREMENT

Goal/Question/Metric paradigm is a technique for identifying

meaningful metrics for any software process .

Highlighted points are :

Establish an explicit measurement goal

Define a set of questions that must be answered in order to

achieve the goal

Identify well formulated metrics that help to answer the question


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ATTRIBUTES OF SOFTWARE METRICS

Practical support is expected

Measurement demands should be simple

Less esoteric and easy to understand for real world professionals Should specify the basic intuitive notion of a high-quality software

Derived metrics and measures should lead to simple and computable

conclusions

Easy to derive the metrics and should not demand inordinate effort or time


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THE PRODUCT METRICS LANDSCAPE

Landscape of a metrics gives you the various aspects and key points of the model

and what exactly the metrics includes :

N.B. : please

lick your

TECH-MAX

for this !!!


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SOFTWARE QUALITY

Software quality is the conformance to explicitly stated functional andperformance requirements , explicitly documented development standards andimplicit characteristics that are expected of all professionally developed software

Software requirements are reference from which quality is measured, lack ofconformance is lack of quality.

Specified standards define a set of development criteria that guide the manner inwhich software is engineered

There are some implied requirements which are must with specified

criteria There are some software quality standards developed based on the

above points yet they vary as per applications and users of the software.


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Product

Revision

ProductTransition

Productoperation

Maintainability

Flexibility

Testability

Portability

Reusability

Interoperability

Correctness

Reliability

Usability

Integrity

Efficiency

McCalls Quality Factors


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I.S.O. 9126 QUALITY FACTORS

The six standard attributes that are involved are:

Functionality

Usability

Maintainability

Portability

Reliability

Efficiency


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BUSINESS PROCESS FOR QUALITY

DEVELOPMENT


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WHY TO HAVE QUALITY CHECK WITH PRODUCT

METRICS???

Deliver performance

Restrict Under-Quality

output.

Customer satisfaction


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PERFORMANCE MATTERS!!!


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TYPICAL QUESTIONS

Define software quality

ISO Factors

Steps for Effective measurement Explain the factors in McCall restriction

Product metrics landscape

Goal oriented measurement

Distinguish between Measure and Metric

Documents

UNIT-VI Product Metrix