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public:99_annexes:annex-b-terms-and-definitions:q:quality_characteristic [2026/09/12 17:42] – removed - external edit (Unknown date) 127.0.0.1public:99_annexes:annex-b-terms-and-definitions:q:quality_characteristic [2026/09/12 17:43] (current) – ↷ Links adapted because of a move operation nick_dido
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 +====== Quality Characteristic ======
  
 +[[public:99_annexes:annex-b-terms-and-definitions:start|Go up to Terms and Definitions]]
 +
 +===== Discussion =====
 +
 +A Quality Characteristic is an [[public:99_annexes:annex-b-terms-and-definitions:e:evaluation_characteristic|Evaluation Characteristic]] concerning the degree to which a subject exhibits a quality property.
 +
 +A Quality Characteristic can apply to:
 +
 +  * A [[public:99_annexes:annex-b-terms-and-definitions:c:candidate_solution|Candidate Solution]]
 +  * A [[public:99_annexes:annex-b-terms-and-definitions:d:distributed_system|Distributed System]]
 +  * A [[public:99_annexes:annex-b-terms-and-definitions:n:node|Node]]
 +  * A [[public:99_annexes:annex-b-terms-and-definitions:n:node_set|Node Set]]
 +  * A [[public:99_annexes:annex-b-terms-and-definitions:t:test_item|Test Item]]
 +  * A software product
 +  * A hardware product
 +  * A service
 +  * A technology
 +  * A process
 +  * A result
 +  * Another evaluation subject
 +
 +Quality Characteristics can include:
 +
 +  * Functional Correctness
 +  * Performance Efficiency
 +  * Reliability
 +  * Operational Stability
 +  * Security
 +  * Interoperability
 +  * Scalability
 +  * Maintainability
 +  * Recoverability
 +
 +A Quality Characteristic can be decomposed into more specific Quality Characteristics or quality subcharacteristics.
 +
 +A Quality Characteristic can identify:
 +
 +  * Its identity
 +  * Its name
 +  * Its description
 +  * Its parent Quality Characteristic
 +  * Its child Quality Characteristics
 +  * Its evaluation subject
 +  * Its applicable context
 +  * Its applicable measures
 +  * Its applicable measurement methods
 +  * Its applicable measurement units
 +  * Its applicable reference values
 +  * Its applicable DIDO [[public:99_annexes:annex-b-terms-and-definitions:b:baseline|Baselines]]
 +  * Its applicable [[public:99_annexes:annex-b-terms-and-definitions:v:validation_criteria|Validation Criteria]]
 +  * Its applicable [[public:99_annexes:annex-b-terms-and-definitions:a:acceptance_criteria|Acceptance Criteria]]
 +  * Its applicable [[public:99_annexes:annex-b-terms-and-definitions:g:governance_policy|Governance Policies]]
 +  * Its [[public:99_annexes:annex-b-terms-and-definitions:e:evidence|Evidence]]
 +  * Its [[public:99_annexes:annex-b-terms-and-definitions:p:provenance|Provenance]]
 +  * Its [[public:99_annexes:annex-b-terms-and-definitions:t:traceability|Traceability]]
 +
 +===== Definition =====
 +
 +//[[public:99_annexes:annex-b-terms-and-definitions:e:evaluation_characteristic|Evaluation Characteristic]] concerning the degree to which a subject exhibits a quality property//
 +
 +===== Source =====
 +
 +Adapted from:
 +
 +  * [[https://www.iso.org/standard/78176.html|ISO/IEC 25010:2023, Systems and software Quality Requirements and Evaluation (SQuaRE) — Product quality model]]
 +  * [[https://www.iso.org/standard/78175.html|ISO/IEC 25002:2024, Systems and software Quality Requirements and Evaluation (SQuaRE) — Quality model overview and usage]]
 +  * [[public:99_annexes:annex-b-terms-and-definitions:e:evaluation_characteristic|Evaluation Characteristic]]
 +  * DIDO Reference Implementation Conceptual Model
 +  * DIDO-TE draft Requirements Register
 +
 +ISO/IEC 25002 describes quality models composed of quality characteristics and subcharacteristics.
 +
 +ISO/IEC 25010 defines a product-quality model containing characteristics and subcharacteristics applicable to ICT and software products.
 +
 +This definition places Quality Characteristic within the broader DIDO Evaluation Characteristic model so DIDO-TE can evaluate both quality properties and non-quality characteristics such as cost and resource consumption.
 +
 +===== Note =====
 +
 +Every Quality Characteristic is an Evaluation Characteristic. An Evaluation Characteristic is not necessarily a Quality Characteristic.
 +
 +A Quality Characteristic differs from a measure:
 +
 +  * A Quality Characteristic identifies the quality property subject to evaluation
 +  * A measure identifies how a value is assigned to the Quality Characteristic
 +
 +A Quality Characteristic differs from a quality requirement:
 +
 +  * A Quality Characteristic identifies a quality property
 +  * A quality requirement establishes a normative obligation concerning that quality property
 +
 +A Quality Characteristic differs from a [[public:99_annexes:annex-b-terms-and-definitions:t:test_result|Test Result]]:
 +
 +  * A Quality Characteristic identifies what is evaluated
 +  * A Test Result records an outcome produced by [[public:99_annexes:annex-b-terms-and-definitions:t:test_execution|Test Execution]]
 +
 +One Test Result can provide information about multiple Quality Characteristics.
 +
 +Multiple Test Results can contribute to the evaluation of one Quality Characteristic.
 +
 +A Quality Characteristic does not by itself establish:
 +
 +  * A required value
 +  * A minimum value
 +  * A maximum value
 +  * A preferred direction
 +  * A measurement method
 +  * A permitted tolerance
 +  * An acceptance threshold
 +
 +The applicable Acceptance Criteria or Validation Criteria establish those constraints.
 +
 +A higher numerical value does not necessarily indicate better quality. The interpretation depends on the Quality Characteristic and its applicable measure.
 +
 +For example:
 +
 +  * Higher throughput can indicate greater Performance Efficiency
 +  * Higher response time can indicate lower Performance Efficiency
 +  * Higher failure frequency can indicate lower Reliability
 +  * Higher recovery success can indicate greater Recoverability
 +
 +===== Example =====
 +
 +A DIDO-TE comparative evaluation selects Reliability as a Quality Characteristic.
 +
 +The applicable Acceptance Criteria establish:
 +
 +  * The Candidate Solutions subject to evaluation
 +  * The workload
 +  * The Test Environment
 +  * The duration of the evaluation
 +  * The failure conditions
 +  * The Reliability measures
 +  * The required measurement precision
 +  * The comparison method
 +
 +DIDO-TE produces Test Results used to evaluate Reliability for each Candidate Solution.
 +
 +Reliability identifies the quality property being evaluated. The Test Results contain the observations and measurements used to evaluate it.
 +
 +----
 +
 +<WRAP centeralign>
 +© 2026 Dido Solutions, Inc. and Jackrabbit Consulting, Inc.
 +</WRAP>