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 It has been replaced by ISO/IEC.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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It defines six product quality characteristics and in an annex provides a suggestion of quality subcharacteristics. An attribute is an entity which can be verified or measured in the software product. These biases include changing priorities after the start of a project or not having any ixo definitions of “success”.
Attributes of software that bear on the effort needed to install the software in a specified environment. Attributes of software that bear on response and processing times and on throughput rates in performances its function.
ISO/IEC – Wikipedia
Attributes of software that make the software adhere to application related standards or conventions or regulations in laws and similar prescriptions. Views Read Edit View history. This 9126–2 provides external metrics for measuring software quality characteristics.
Each quality sub-characteristic e. Quality-in-use metrics are only available when 91262- final product is used in real conditions. Compared to”security” and “compatibility” were added as main characteristics. They have been reworded and jso new ones added. The objective of this standard is to provide a framework for the evaluation of software quality.
Use British English Oxford spelling from January There is also a definition of quality in use which defines the user’s view as a result of using the software.
Ideally, the internal quality determines the external quality and external quality determines quality in use. 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 91226-2 or indirect it is not derived from measures of the behaviour of the system.
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 isl the software considered. This may be done, for example, by specifying target values for quality metrics which evaluates the degree of presence of quality attributes. Attributes of software that make the software adhere to standards or conventions relating to portability.
The subcharacteristics have been moved from the annex to become part of the standard. Internal metrics are applicable to a non executable software product during designing and coding in early stage of development process.
ESSI-SCOPE Quality Characteristics and their application
An external metric is a quantitative scale and measurement method, which can be used for iiso 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 bear on the presence and appropriateness of a set of functions for specified tasks. 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.
This part provides internal metrics for measuring software quality characteristics.
ISO 9126: The Standard of Reference
On doing so, however, it leaves up to each organization the task of specifying precisely its own model. Quality characteristics and subcharacteristics. This standard stems from the GE model for describing software quality, presented in by McCall et al.
Information technology – Software Product Evaluation – Quality characteristics and guidelines for their use – 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 912-2 time and effort needed for it.
The standard provides a framework for organizations to define a quality model for a software product. Attributes of software that bear on the effort needed for modification, fault removal isl for environmental change. As a result, the notion of user extends to operators as well as to programmers, which are users of components such as software libraries.
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. 91262 technology – Software quality characteristics and metrics – Part 1: List of International Electrotechnical Commission standards. Attributes are not defined in the standard, as they vary between different software products. The current standard is under review. Information technology – Software quality characteristics and metrics – Part 2: Software product is defined in a broad ios ISO standards by standard number.
Attributes of software that bear on the amount of resource used and the duration of such use in performing its function. External metrics are applicable to an executable software product during testing or operating in later stage of development and after entering to operation process.
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