ISO/IEC TS 5723:2022

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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General Information

• Status: Published
• Publication Date: 21-Jul-2022
• ICS: 01.040.35 - Information technology (Vocabularies)
• ICS: 35.020 - Information technology (IT) in general
• Technical Committee: ISO/IEC JTC 1 - Information technology
• Drafting Committee: ISO/IEC JTC 1 - Information technology
• Current Stage: 9060 - Close of review
• Completion Date: 04-Mar-2029

Overview

ISO/IEC TS 5723:2022 - Trustworthiness - Vocabulary provides a concise, standardized vocabulary for describing the trustworthiness of systems and their associated services. The technical specification defines trustworthiness as the ability to meet stakeholders’ expectations in a verifiable way and presents a selected set of trustworthiness characteristics and supporting definitions that apply across IT and other domains where IT is used (IoT, AI, OT/IT convergence, etc.).

Key topics

• Core definition: Trustworthiness = ability to meet stakeholders’ expectations in a verifiable way (emphasizes measurability and objective evidence).
• Selected characteristics (defined and contextualized for systems, data or governance):
  • Accountability, accuracy, authenticity, availability
  • Controllability, integrity (data and systems), privacy
  • Quality (data and system perspectives), reliability (system and cybersecurity perspectives)
  • Resilience, robustness, safety, security
  • Transparency, usability
• Supporting definitions important for assessment and specification: stakeholder, measurability, metric, objective evidence, capability, system, system of systems, verifiable.
• Scope and intent: Horizontal IT focus - intended for use across domains to enable a common understanding of trustworthiness vocabulary.
• Standards alignment: Terms are drawn from ISO and IEC terminology repositories and related standards (e.g., ISO/IEC 27000 series, ISO/IEC 22989, ISO 9000, ISO 9241-11).

Practical applications

ISO/IEC TS 5723:2022 is a reference vocabulary to:

• Create clear, consistent requirements and acceptance criteria in procurement, contracts, and specifications for products, services and systems.
• Support system architects, product managers, and designers in specifying trustworthiness-related attributes (e.g., privacy, security, resilience).
• Guide risk managers, auditors and compliance teams when assessing whether systems meet stakeholder expectations using verifiable evidence and metrics.
• Help regulators and policymakers align terminology when drafting guidance or sectoral rules for trustworthy AI, IoT, or critical infrastructure.
• Serve as a foundation for test plans, measurement frameworks and trustworthiness assessment methodologies (by clarifying terms like measurability, metric and objective evidence).

Who should use it

• IT governance and compliance officers
• System and solution architects, software and AI developers
• Security, privacy and safety professionals
• Procurement and contract managers
• Standards writers and policy designers
• Auditors and certification bodies

Related standards

Relevant companion documents cited in the specification include ISO/IEC 27000 (information security vocabulary), ISO/IEC 22989 (AI terminology), ISO 9000 (quality management vocabulary), and ISO 9241-11 (usability). Use ISO/IEC TS 5723:2022 as the common vocabulary when integrating these domain-specific controls and requirements.

Keywords: ISO/IEC TS 5723:2022, trustworthiness, vocabulary, trustworthiness characteristics, verifiable, measurability, accountability, security, privacy, resilience, systems.

Standards Content (Sample)

TECHNICAL ISO/IEC TS
SPECIFICATION 5723
First edition
2022-07
Trustworthiness — Vocabulary
Reference number
© ISO/IEC 2022
© ISO/IEC 2022
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
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or ISO’s member body in the country of the requester.
ISO copyright office
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Published in Switzerland
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© ISO/IEC 2022 – All rights reserved

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
iii
© ISO/IEC 2022 – All rights reserved

Foreword
ISO (the International Organization for Standardization) and IEC (the International Electrotechnical
Commission) form the specialized system for worldwide standardization. National bodies that are
members of ISO or IEC participate in the development of International Standards through technical
committees established by the respective organization to deal with particular fields of technical
activity. ISO and IEC technical committees collaborate in fields of mutual interest. Other international
organizations, governmental and non-governmental, in liaison with ISO and IEC, also take part in the
work.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for
the different types of document should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives or www.iec.ch/members_
experts/refdocs).
Attention is drawn to the possibility that some of the elements of this document may be the subject
of patent rights. ISO and IEC shall not be held responsible for identifying any or all such patent
rights. Details of any patent rights identified during the development of the document will be in the
Introduction and/or on the ISO list of patent declarations received (see www.iso.org/patents) or the IEC
list of patent declarations received (see https://patents.iec.ch).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to the
World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see www.iso.org/
iso/foreword.html. In the IEC, see www.iec.ch/understanding-standards.
This document was prepared by Joint Technical Committee ISO/IEC JTC 1, Information technology.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html and www.iec.ch/national-
committees.
iv
© 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
...