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 It has been replaced by ISO/IEC.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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This part provides internal metrics for measuring software quality characteristics. Retrieved from ” https: Software product is defined in a broad sense: The objective of this standard is to provide a framework for the evaluation of software quality. jso

An external metric is a quantitative scale and measurement method, which oso be used for measuring an attribute or characteristic of a software product, derived from the behaviour of the system of which it is a part.

This page was last edited on 12 Septemberat ISO standards by standard number.

Attributes of software that bear on response and processing times and on throughput rates in performances its function. An internal 99126-2 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.

Use British English 912-62 spelling from January The standard provides a framework for organizations to define a quality model for a software product. Attributes are not defined in the standard, as they vary between different software products. Information technology – Software quality characteristics and metrics – Part 3: There is also a definition of quality in use which defines 91266-2 user’s view as a result of using the software.

ISO/IEC 9126

They have been reworded and several new ones added. Attributes of software that bear on the opportunity for its adaptation to different specified environments without applying other actions or means than those provided for this purpose for the software considered.

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Information technology – Software Product Evaluation – Quality characteristics and guidelines for their use – Quality-in-use metrics are only available when the final product is used in real conditions. Internal metrics are applicable to a non executable software product during designing and coding in early stage of development process.

These biases include changing priorities after the start of a project or not having any clear definitions of “success”. External metrics are applicable to an executable software product during testing or operating in later stage of development and after entering to operation process.

Ideally, the internal quality determines the external quality and external quality determines quality in use. Attributes of software that bear on its ability to maintain a specified level isp performance in case of software faults or of infringement of its specified interface.

Compared toisoo and “compatibility” were added as main characteristics. Views Read Edit View history. ISO has eight product quality characteristics in contrast to ISO ‘s sixand 31 subcharacteristics.

As a result, the notion of user extends to operators as well as to programmers, which are users of components such as software libraries.

An attribute is an entity which can be verified or measured in kso software product. On doing so, however, it leaves up to each organization the task of specifying precisely its own 91262. Attributes of software that bear on the iwo to re-establish its level of performance and recover the data directly affected in case of a failure and on the time and effort needed for it. Attributes of software that bear on io effort needed for diagnosis of deficiencies or causes of failures, or for identification of parts to be modified.

ISO/IEC TR – Software engineering — Product quality — Part 2: External metrics

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. 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 amount of resource used and the duration of such use in oso its function.

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Attributes of software that bear on opportunity and effort using it in the place of specified other software in the environment 91126-2 that software. Each quality sub-characteristic e. This part provides external metrics for measuring software quality characteristics. Attributes of software that make the software adhere to standards or conventions relating to portability. Attributes of software that bear on the effort needed for modification, fault removal or for environmental change.

The current standard is under review. This may be done, for example, by specifying target values for quality metrics which evaluates the degree of presence of quality attributes. List of International Electrotechnical Commission standards. Information technology – Software quality characteristics and metrics – Part 2: By using this site, you agree to the Terms of Use and Privacy Policy.

This standard stems from the GE model for describing software quality, presented in by McCall et al. It defines six product quality characteristics and in an annex provides a suggestion of quality subcharacteristics. Attributes of software that bear on the effort needed to install the software in a specified environment. Information technology – Software quality characteristics and metrics – Part 1: Attributes of software that bear on the presence and appropriateness of a set of functions for specified tasks.

The subcharacteristics have been moved from the annex to become part of the standard. Quality characteristics and subcharacteristics. From Wikipedia, the free encyclopedia. Attributes of software that make the software adhere to application related standards or conventions or regulations in laws and similar prescriptions.