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Software Testing and Quality Assurance Theory and Practice Chapter 17 Software Quality - page 21 / 28

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Software Testing and QA Theory and Practice (Chapter 17: Software Quality)

© Naik & Tripathy

21

The ISO 9126 Quality Characteristics

McCall’s quality model vs. ISO 9126 model

What is called quality factor in McCall’s model is called a quality subcharacteristic in the ISO 9126 model.

The following quality factors/characteristics are found in both the models.

reliability, usability, efficiency, maintainability, and portability

Differences between the two models

The ISO 9126 model emphasizes on characteristics visible to the users, whereas the McCall model considers internal qualities as well.

In McCall’s model, one quality criterion can impact many quality factors, whereas in the ISO 9126 model, one subcharacteristic impacts exactly one quality characteristic.

A high-level quality factor, such as testability, in the McCall’s model is a low-level subcharacteristic of maintainability in the ISO 9126 model.

Concerns

There is no consensus about what high-level quality factors are most important at the top level. McCall, et al. define 11 high-level quality factors, whereas there are only six in the ISO 9126 document.

There is no consensus regarding what is a top-level quality factor/ characteristic and what is a more concrete quality criterion/ subcharacteristic.

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