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 It has been replaced by ISO/IEC.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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There is also a definition of quality in use which defines the user’s view as a result of using the software. 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 isi time and effort needed for it.
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.
This may iiso done, for example, by specifying target values for quality metrics which evaluates the degree of presence of quality attributes. From Wikipedia, the free encyclopedia.
ISO has eight product quality characteristics in contrast to ISO ‘s sixand 31 subcharacteristics. List of International Electrotechnical Commission standards.
Attributes of software that make the software adhere to standards or conventions relating to portability. Attributes of 99126-2 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 bear on the amount of resource used and the duration of such use in performing its function. 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.
Ideally, the internal quality determines the external quality io external quality determines quality in use. 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.
Compared to”security” and “compatibility” were added as main characteristics.
This part provides internal metrics for measuring software quality characteristics. 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 the effort needed for diagnosis of deficiencies or causes of failures, or for identification of parts to be modified. Software product is defined in a broad sense: On doing so, however, it leaves up to each organization the task of specifying precisely its own model.
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The objective of this standard is to provide a framework for the evaluation of software quality. This standard stems from the GE model for describing software quality, presented in by McCall et al. ISO standards by standard number.
Use British English Oxford spelling from January They have been reworded and several new ones added.
The current standard is under review. Information technology – Software quality characteristics and metrics – Part 2: Attributes are not defined in the standard, as they vary between different software 9126-22. 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.
As a result, the notion of user extends to operators as well as 99126-2 programmers, which are users of components such as software libraries. Each quality sub-characteristic e.
ESSI-SCOPE Quality Characteristics and their application
Attributes of software that bear on response and processing times and on throughput rates in performances its function. Quality-in-use metrics are only available when the final product is used in real conditions.
Attributes of software that bear on the effort needed to install the software in a specified environment. These biases include changing priorities after the start of a project or not having any clear definitions of “success”. Attributes of software that bear on opportunity and effort using it in the place of specified other software in the environment of that software.
Internal metrics are applicable to a non executable software product during designing and coding in early stage of development process. Attributes of software that bear on the effort needed for modification, fault removal or for environmental change. Attributes of software that bear on the presence and appropriateness of a set of functions for specified tasks. Information technology – Software Product Evaluation – Quality characteristics and guidelines for their use – This part provides external metrics for measuring software quality characteristics.