National foreword

This Published Document is the UK implementation of ISO/PAS 8926:2024.

The UK participation in its preparation was entrusted to Technical Committee AUE/32/1.

A list of organizations represented on this committee can be obtained on request to its committee manager.

Contractual and legal considerations

This publication has been prepared in good faith, however no representation, warranty, assurance or undertaking (express or implied) is or will be made, and no responsibility or liability is or will be accepted by BSI in relation to the adequacy, accuracy, completeness or reasonableness of this publication. All and any such responsibility and liability is expressly disclaimed to the full extent permitted by the law.

This publication is provided as is, and is to be used at the recipient’s own risk.

The recipient is advised to consider seeking professional guidance with respect to its use of this publication.

This publication is not intended to constitute a contract. Users are responsible for its correct application.

This publication is not to be regarded as a British Standard.

Compliance with a Published Document cannot confer immunity from legal obligations.

This Published Document was published under the authority of the Standards Policy and Strategy Committee on 29 February 2024.

Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.

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 ISO 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).

ISO draws attention to the possibility that the implementation of this document may involve the use of (a) patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent rights in respect thereof. As of the date of publication of this document, ISO had not received notice of (a) patent(s) which may be required to implement this document. However, implementers are cautioned that this may not represent the latest information, which may be obtained from the patent database available at www.iso.org/patents. ISO shall not be held responsible for identifying any or all such patent rights.

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.

This document was prepared by Technical Committee ISO/TC 22, Road vehicles, Subcommittee SC 32, Electrical and electronic components and general system aspects.

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.

Introduction

This document addresses the use of pre-existing software architectural elements not originally developed in accordance with the ISO 26262:2018 series in the context of development aiming to achieve functional safety according to the ISO 26262:2018 series. It describes criteria for the integration of a pre-existing software architectural element to achieve functional safety.

The criteria establish confidence in a pre-existing software architectural element that enables its use in safety-related embedded software developed in accordance with the ISO 26262:2018 series when:

it meets the needs of a target software architectural design because it provides required safety-related functionalities and properties (including safety mechanisms);
it meets the needs of a target software architectural design because of its static and dynamic design, its interfaces and its resources are used.

The evidence supporting confidence is kept up to date as part of the safety case and is subject to confirmation measures.

1 Scope

This document describes a framework for functional safety to enable the use of pre-existing software architectural elements not originally developed in accordance with the ISO 26262:2018 series, but intended to be integrated into safety-related embedded software conformant with the ISO 26262:2018 series by:

determining relevant criteria when using the pre-existing software architectural element as a safety-related element of safety-related embedded software;
determining relevant criteria inherent to the pre-existing software architectural element, e.g. needs for external safety mechanisms to detect and control failures caused by the pre-existing software architectural element;
providing suitable evidence and arguments for use of the pre-existing software architectural element that can include applicable procedures, techniques and safety measures;
supporting the fulfilment of software safety requirements when using the pre-existing software architectural element as a safety-related element of safety-related embedded software;
supporting the integration of the pre-existing software architectural element as a safety-related element of safety-related embedded software.

2 Normative references

3 Terms and definitions

4 Use of pre-existing software architectural elements into safety-related embedded software conformant with the ISO 26262 series

4.1 Objectives

4.2 General

4.3 Input to this clause

4.4 Requirements and recommendations

4.5 Work products

Bibliography

PD ISO/PAS 8926:2024

Road vehicles. Functional safety. Use of pre-existing software architectural elements

Current

Published:

29 Feb 2024