ISO/IEC TS 5723:2022
(Main)Trustworthiness — Vocabulary
Trustworthiness — Vocabulary
This document provides a definition of trustworthiness for systems and their associated services, along with a selected set of their characteristics.
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TECHNICAL ISO/IEC TS
SPECIFICATION 5723
First edition
2022-07
Trustworthiness — Vocabulary
Reference number
© ISO/IEC 2022
© ISO/IEC 2022
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Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
3.1 Trustworthiness . 1
3.2 Selected trustworthiness characteristics . 1
3.3 Selected supporting definitions . 4
Bibliography . 7
Index . 9
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© ISO/IEC 2022 – All rights reserved
Foreword
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© ISO/IEC 2022 – All rights reserved
Introduction
Recent times have seen an increase in the complexity of integrating technology bringing together
various viewpoints. Some examples of this are the convergence of operational technologies (OT) and
information technologies (IT) as seen in the Internet of Things (IoT), the rise of big data and artificial
intelligence (AI).
The complexity as well as the criticality, from both a safety and a mission point of view, have given
rise to the need to communicate both the trustworthiness of products, services and technologies, and
the trustworthiness of organizations that are providing these. Having a common understanding of
the characteristics that can be used to describe trustworthiness and a common way of defining the
vocabulary and characteristics will allow stakeholders to make a judgement as to whether a product,
service or technology meets the stakeholder expectations.
This document is primarily intended for use horizontally in an IT domain. It is applicable to all domains
in which IT is used.
The terms and definitions in subclause 3.2 are extracted from the ISO and the IEC vocabulary
repositories. Where multiple definitions are given, those that best fit the current context of
trustworthiness have been selected. For some characteristics, multiple definitions have been retained
for different domains.
The terms and definitions in subclause 3.3 are provided for completeness.
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© ISO/IEC 2022 – All rights reserved
TECHNICAL SPECIFICATION ISO/IEC TS 5723:2022(E)
Trustworthiness — Vocabulary
1 Scope
This document provides a definition of trustworthiness for systems and their associated services, along
with a selected set of their characteristics.
2 Normative references
There are no normative references in this document.
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
3.1 Trustworthiness
3.1.1
trustworthiness
ability to meet stakeholders’ (3.3.8) expectations in a verifiable (3.3.12) way
Note 1 to entry: Depending on the context or sector, and also on the specific product or service, data, technology
and process used, different characteristics apply and need verification to ensure stakeholders’ expectations are
met.
Note 2 to entry: Characteristics of trustworthiness include, for instance, accountability (3.2.1), accuracy (3.2.2),
authenticity (3.2.3), availability (3.2.4), controllability (3.2.5), integrity (3.2.7, 3.2.8), privacy (3.2.9), quality
(3.2.10, 3.2.11), reliability (3.2.12, 3.2.13), resilience (3.2.14, 3.2.15), robustness (3.2.16), safety (3.2.17), security
(3.2.18), transparency (3.2.19, 3.2.20) and usability (3.2.21).
Note 3 to entry: Trustworthiness is an attribute that can be applied to services, products, technology, data and
information as well as to organizations.
Note 4 to entry: Verifiability (3.3.12) includes measurability (3.3.5) and demonstrability by means of objective
evidence (3.3.7).
3.2 Selected trustworthiness characteristics
3.2.1
accountability
state of being accountable (3.3.1)
Note 1 to entry: Accountability relates to an allocated responsibility. The responsibility can be based on
regulation or agreement or through assignment as part of delegation.
Note 2 to entry: For systems (3.3.10), accountability is a property that ensures that actions of an entity can be
traced uniquely to the entity (see ISO 7498-2:1989, 3.3.3).
© ISO/IEC 2022 – All rights reserved
Note 3 to entry: In a governance context, accountability is the obligation of an individual or organization to
account for its activities, for completion of a deliverable or task, accept the responsibility for those activities,
deliverables or tasks, and to disclose the results in a transparent manner (see ISO/TS 21089:2018, 3.3.1).
[SOURCE: ISO/IEC 38500:2015, 2.3, modified — Note 2 to entry and Note 3 to entry have been added.]
3.2.2
accuracy
measure of closeness of results of observations, computations, or estimates to the true values or the
values accepted as being true
[SOURCE: ISO 17572-1:2022, 3.1]
3.2.3
authenticity
property that an entity is what it claims to be
[SOURCE: ISO/IEC 27000:2018, 3.6]
3.2.4
availability
property of being accessible and usable on demand by an authorized entity
[SOURCE: ISO/IEC 27000:2018, 3.7]
3.2.5
controllability
property of a system (3.3.10) that allows a human or another external agent to intervene in the system’s
functioning
Note 1 to entry: Such a system is heteronomous.
[SOURCE: ISO/IEC 22989:2022, 3.5.6, modified — The admitted term “controllable” has been removed
and “an AI system” has been changed to “a system”.]
3.2.6
information security
preservation of confidentiality, integrity (3.2.7, 3.2.8) and availability (3.2.4) of information
Note 1 to entry: In addition, other properties, such as authenticity (3.2.3), accountability (3.2.1), non- repudiation,
and reliability (3.2.12, 3.2.13) can also be involved.
[SOURCE: ISO 27000:2018, 3.28]
3.2.7
integrity
property whereby data have not been altered in an unauthorized manner since they were
created, transmitted, or stored
[SOURCE: ISO/IEC 29167-19:2019, 3.3, modified — The domain has been added.]
3.2.8
integrity
property of accuracy (3.2.2) and completeness
[SOURCE: ISO/IEC 27000:2018, 3.36, modified — The domain has been added.]
© ISO/IEC 2022 – All rights reserved
3.2.9
privacy
freedom from intrusion into the private life or affairs of an individual
[SOURCE: ISO/IEC 2382:2015, 2.22, modified — The section “when that intrusion results from undue or
illegal gathering and use of data about that individual" has been removed from the definition and the
Note to entry has been removed.]
3.2.10
quality
degree to which the characteristics of data satisfy stated and implied needs when used under
specified conditions
[SOURCE: ISO/IEC 25024:2015, 4.11, modified — “data” is removed from the term and the domain has
been added.]
3.2.11
quality
degree to which a set of inherent characteristics of an object fulfils requirements
Note 1 to entry: An object can be a product, process or service.
[SOURCE: ISO 9000:2015, 3.6.2, modified — Original Note 1 to entry and Note 2 to entry have been
removed; a new Note 1 to entry has been added and the domain of “” has been added.]
3.2.12
reliability
property of consistent intended behaviour and results
[SOURCE: ISO/IEC 27000:2018, 3.55, modified — The domain has been added.]
3.2.13
reliability
ability of an item to perform as required, without failure, for a given time interval, under
given conditions
Note 1 to entry: The time interval duration can be expressed in units appropriate to the item concerned (e.g.
calendar time, operating cycles, distance run, etc.) and the units should always be clearly stated.
Note 2 to entry: Given conditions include aspects that affect reliability, such as: mode of operation, stress levels,
environmental conditions, and maintenance.
[SOURCE: IEC 60050-192:2015, 192-01-24, modified — The domain has been changed, the phrase "of an
item" has been added at the beginning of the definition and Note 3 to entry has been removed.]
3.2.14
resilience
ability to anticipate and adapt to, resist, or quickly recover from a potentially disruptive
event, whether natural or man-made
[SOURCE: ISO 15392:2019, 3.21, modified — The domain has been added.]
3.2.15
resilience
capability (3.3.2) of a system (3.3.10) to maintain its functions and structure in the face of
internal and external change, and to degrade gracefully when this is necessary
3.2.16
robustness
ability of a system (3.3.10) to maintain its level of performance under a variety of circumstances
[SOURCE: ISO/IEC 22989:2022, 3.5.12, modified — “any” has been changed to “a variety of”.]
© ISO/IEC 2022 – All rights reserved
3.2.17
safety
property of a system (3.3.10) such that it does not, under defined conditions, lead to a state in which
human life, health, property, or the environment is endangered
[SOURCE: ISO/IEC/IEEE 12207:2017, 3.1.48, modified — “expectation that a system” has been changed
to “property of a system such that it”.]
3.2.18
security
resistance to intentional, unauthorized act(s) designed to cause harm or damage to a system (3.3.10)
[SOURCE: ISO/IEC 23643:2020, 3.16]
3.2.19
transparency
open, comprehensive, accessible, clear and understandable presentation of information
[SOURCE: ISO 16759:2013, 3.8.4, modified — The domain has been added.]
3.2.20
transparency
property of a system (3.3.10) or process to imply openness and accountability (3.2.1)
[SOURCE: ISO/IEC 27036-3:2013, 3.3, modified — The domain has bee
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