ISO 9126-2 PDF

ISO/IEC Software engineering — Product quality was an international standard for the evaluation of software quality. It has been replaced by ISO/IEC. ISO/IEC TR (E) ISO/IEC Software engineering – Product quality – Part 2: External metrics Contents Download Table | Examples of the use of base measures in ISO from publication: An Information Model for Software Quality Measurement with ISO.

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Information technology – Software quality characteristics and metrics – Part 1: The current standard is under review. The standard provides a framework for organizations to define a quality model for a software product. Ideally, the internal quality determines the external quality and external quality determines quality in use.

Use British English Oxford spelling from January Information technology – Software quality characteristics and metrics – Part 3: As a result, the notion of user extends to operators as well as to programmers, which are users of components such as software isl.

These biases include changing priorities after the start of a project or not having any clear definitions of “success”. Attributes of software that make the software adhere to standards or conventions relating to portability.

Iwo Wikipedia, the free encyclopedia. An external metric is a quantitative scale and measurement method, which can be used for measuring an attribute or characteristic of a software product, derived 912-62 the behaviour of the system of which it is a part. This page was last edited on 12 Septemberat Attributes of software that make the software adhere to application related standards or conventions or regulations in laws and similar prescriptions.

Compared to”security” and “compatibility” were added as main characteristics. Attributes of software that bear on the is to re-establish its level of performance and recover the data directly affected in case of a failure and on the time lso effort needed for it.

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Each quality sub-characteristic e. An internal metric is a quantitative scale and measurement method, which can be used for measuring an attribute or characteristic of a software product, derived from the product itself, either direct or indirect it is not derived from measures of the behaviour of the system.

Attributes of software that bear on opportunity and effort using it in the place of specified other software in the environment of that software. This part provides the concepts introduced in the original standard ie a recommended quality model which categorizes software quality in six characteristics, which are further sub-divided into subcharacteristics.

The subcharacteristics have been moved sio the annex to become part of the standard.

By using this site, you agree to 91226-2 Terms of Use and Privacy Policy. On doing so, however, it leaves up to each organization the task of specifying precisely its own model. List of International Electrotechnical Commission standards.

Attributes of software that bear on the amount of resource used and the duration of such use in performing its function.

ESSI-SCOPE Quality Characteristics and their application

Views Read Edit View history. Attributes of software that bear on its ability to maintain a specified level of performance in case of software faults or of kso of its specified interface. ISO standards by standard number. Attributes of software that bear on the presence and appropriateness of a set of functions for specified tasks. Information technology – Software Product Evaluation – 91226-2 characteristics and guidelines for their use – Information technology – Software quality characteristics and metrics – Part 2: There is also a definition of quality in use which defines the user’s view as a result of using the software.

This standard stems from the GE model for describing software quality, presented in by McCall et al. The objective of this standard is to provide a framework for the evaluation of software quality.

Quality-in-use metrics are only available when the final product is used in real conditions.

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An attribute is an entity which can be verified or measured in the software product. Internal metrics are applicable to a non executable software product during designing and coding in early stage of development process. This may be done, for example, by specifying target values for quality metrics which evaluates the degree of presence of quality attributes. Retrieved from ” https: They have been reworded ixo several new ones added.

Attributes of software that bear on the effort needed to install the software in a specified environment. Attributes of software that bear on the effort needed for modification, fault removal or for environmental change. ISO has eight product quality characteristics in contrast to ISO ‘s sixand 31 subcharacteristics.

Quality characteristics and subcharacteristics. This part provides external metrics for measuring software quality characteristics. Attributes of software that bear on response and processing times and on throughput rates in performances its function.

It defines six product quality characteristics and in an annex 912-62 a suggestion of quality subcharacteristics. Attributes of software that bear on its ability to prevent unauthorized access, whether accidental or deliberate, to programs or data.

Attributes of software that bear on the effort needed for diagnosis of deficiencies or causes of failures, or for identification of parts to be modified. This part provides internal metrics for measuring software quality characteristics.

ISO/IEC 9126

Attributes are not defined in the standard, as they vary between different software products. External metrics are applicable to an executable software product during testing or operating in later stage of development and after entering to operation process. Software product is defined in a broad sense: