Differences

This shows you the differences between two versions of the page.

--- public:99_annexes:annex-b-terms-and-definitions:r:reliability_criterion [2026/09/12 17:42] – removed - external edit (Unknown date) 127.0.0.1
+++ public:99_annexes:annex-b-terms-and-definitions:r:reliability_criterion [2026/09/12 17:43] (current) – ↷ Links adapted because of a move operation nick_dido
@@ Line 1: / Line 1: @@
+====== Reliability Criterion ======
+[[public:99_annexes:annex-b-terms-and-definitions:start|Go up to Terms and Definitions]]
+===== Discussion =====
+A **Reliability Criterion** provides a measurable basis for assessing the [[public:99_annexes:annex-b-terms-and-definitions:r:reliability|Reliability]] of an entity. It identifies a condition against which the performance of a specified function can be evaluated under specified operating conditions and for a specified period of time.
+A Reliability Criterion may establish a threshold, tolerance, permitted interruption, response time, capacity, error rate, recovery objective, or another measurable condition. The criterion may distinguish required operation, permitted degraded operation, and failed operation.
+Reliability Criteria may be derived from an applicable [[public:99_annexes:annex-b-terms-and-definitions:r:requirement|Requirement]], [[public:99_annexes:annex-b-terms-and-definitions:p:policy|Policy]], [[public:99_annexes:annex-b-terms-and-definitions:c:constraint|Constraint]], profile, agreement, or decision issued by an [[public:99_annexes:annex-b-terms-and-definitions:a:authority|Authority]]. Each criterion retains its governing source, applicability, identity, [[public:99_annexes:annex-b-terms-and-definitions:v:version|Version]], and [[public:99_annexes:annex-b-terms-and-definitions:p:provenance|Provenance]].
+===== Definition =====
+measurable condition used to determine whether an entity performs a specified function under specified conditions for a specified period of time
+===== Source =====
+Derived for DIDO-TE from [[https://www.iso.org/standard/78176.html|ISO/IEC 25010:2023, Systems and software engineering — Systems and software Quality Requirements and Evaluation (SQuaRE) — Product quality model]], Reliability as a product-quality characteristic; and [[https://www.iso.org/standard/78175.html|ISO/IEC 25002:2024, Systems and software engineering — Systems and software Quality Requirements and Evaluation (SQuaRE) — Quality model overview and usage]], relationships among quality models, measurement, requirement definition, and evaluation
+===== Note =====
+A Reliability Criterion is the measurable condition used for an assessment. [[public:99_annexes:annex-b-terms-and-definitions:r:reliability|Reliability]] is the quality characteristic being assessed. An operational state is the observed condition of the assessed entity. An operational failure occurs when the entity does not satisfy an applicable Reliability Criterion.
+A Reliability Criterion does not prescribe a particular monitoring, redundancy, clustering, replication, failover, recovery, or storage mechanism. Those mechanisms are implementation choices unless required by the governing source.
+When applicable Reliability Criteria conflict, the conflict remains explicit and is referred to the appropriate [[public:99_annexes:annex-b-terms-and-definitions:a:authority|Authority]]. The test environment does not invent precedence among conflicting criteria.
+===== Example =====
+A Reliability Criterion specifies that a test-control service performs an acknowledged control operation within two seconds under the defined operating load throughout a four-hour Test Execution. The specified function, operating load, response threshold, and duration provide the measurable basis for determining whether the service satisfies the criterion.
+----
+<WRAP centeralign>
+© 2026 Dido Solutions, Inc. and Jackrabbit Consulting, Inc.
+</WRAP>