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 It has been replaced by ISO/IEC.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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The objective of this standard is to provide a framework for iiso evaluation of software quality. It defines six product quality characteristics and in an annex provides a suggestion of quality subcharacteristics.
The current standard is under review. Information technology – Software quality characteristics and metrics – Part 1: Quality characteristics and subcharacteristics. 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 from ios annex to become part of the standard.
ISO 9126: The Standard of Reference
They 926-2 been reworded and several new ones added. There is also a definition of quality in use which defines the user’s view as a result of using the software. Information technology – Software quality characteristics and metrics – Part 2: This part provides external metrics for measuring software quality characteristics.
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.
External metrics are applicable to an executable software product during testing or operating in later stage of development and after entering to operation process. Information technology – Software quality 9126–2 and metrics – Part 3: 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.
Internal metrics are applicable to a non executable software product during designing and coding in early stage of development process. Information technology – Software Product Evaluation – Quality characteristics and guidelines for their use – Attributes of software that bear on the presence 1926-2 appropriateness of a set of functions for specified tasks.
Attributes of software that make the software adhere to application related standards or conventions or regulations in laws and similar prescriptions. 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 its ability to maintain a specified level of performance in case of software faults or of infringement of its specified interface. 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.
Attributes of software that bear on response and processing times and on throughput rates in performances its function. Attributes of software that bear on the amount of resource used and the duration of such use isk performing its function.
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.
ESSI-SCOPE Quality Characteristics and their application
Attributes of software that bear on the effort needed for modification, fault removal or for environmental change. Attributes of software that bear on the opportunity for its adaptation to different specified environments without applying other actions or means than those provided 9126- this purpose for the software considered.
Attributes of software that bear on the effort needed to install the software in a specified environment.
Attributes of software that make the software adhere to standards or conventions relating to portability. Attributes of software that bear on opportunity and effort using it in the place of specified other software in the environment of that software.