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 It has been replaced by ISO/IEC.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 Product Evaluation – Quality characteristics and guidelines for their use – Attributes of software that bear on response and processing times and on throughput rates in performances its function. Information technology – Software quality characteristics and metrics – Part 1: Attributes of software that bear on the amount of resource used izo the duration of such use in performing its function.

ISO/IEC 9126

Software product is defined in a broad ido On doing so, however, it leaves up to each organization the task of specifying precisely its own model. There is also a definition of quality in use which defines the user’s view as a result of using the software. Attributes are not defined in the standard, as they vary between different software products.

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. Compared to”security” and “compatibility” were added as main characteristics.

Ideally, the internal quality determines the external quality and external quality determines quality in use. Attributes of software that bear on the presence and appropriateness of a set of functions for specified tasks. Attributes of software that bear on its ability to prevent unauthorized access, whether accidental or deliberate, to programs or data.

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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.

External metrics are applicable to an executable software product during testing or operating in later stage of development and after entering to operation process. Use British English Oxford spelling from January It defines six product quality characteristics and in an annex provides a suggestion of quality subcharacteristics. The objective of this standard is to provide a framework for the evaluation of software quality. Attributes of software that bear on its ability to maintain a specified level of performance in case of software faults or of infringement of its specified interface.

These biases include changing priorities after the start of a project or not having any clear definitions of “success”.

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. 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 from the behaviour of the system of which it is a part.

Attributes of software that make the software adhere to standards or conventions relating to portability.

ESSI-SCOPE Quality Characteristics and their application

List of International Electrotechnical Commission standards. Attributes of software that bear on opportunity and effort using it in the place of specified other software in the environment of that software.

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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. Attributes of software that make the software adhere to application related standards or conventions or regulations in laws and similar prescriptions.

This part provides external metrics for measuring software quality characteristics. This page was last edited on 12 Islat An internal metric is a io 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.

Each quality sub-characteristic e. Attributes of software that bear on the capability 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.

ISO 9126: The Standard of Reference

ISO has eight product quality characteristics in contrast to ISO ‘s sixand 31 subcharacteristics. The current standard is under review.

From Wikipedia, the free encyclopedia. Information technology – Software quality characteristics and metrics – Part 3: Retrieved from ” https: Information technology – Software quality characteristics and metrics – Part 2: Quality characteristics and subcharacteristics. Views Read Edit View history. ISO standards by standard number.