National foreword

This Published Document is the UK implementation of ISO/IEC TS 33064:2025. It supersedes PD ISO/IEC TS 15504‑10:2011, which is withdrawn.

The UK participation in its preparation was entrusted to Technical Committee IST/15, Software and systems engineering.

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 31 October 2025.

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).

ISO and IEC draw attention to the possibility that the implementation of this document may involve the use of (a) patent(s). ISO and IEC take 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 and IEC 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 and https://patents.iec.ch. ISO and IEC 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. In the IEC, see www.iec.ch/understanding-standards.

This document was prepared by Joint Technical Committee ISO/IEC JTC 1, Information technology, Subcommittee SC 7, Software and systems engineering.

This document cancels and replaces ISO/IEC TS 15504‑10:2011, which has been technically revised.

The main changes are as follows:

all processes, outcomes, base practices and related process outputs and their descriptions are revised;
this process assessment model includes a process quality attribute of process performance and can be used with other models of process quality, for instance capability as described in ISO/IEC 33020.

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.

Introduction

The documents on process assessment developed by JTC 1/SC 7 (ISO/IEC 33001 to ISO/IEC 33099) define the requirements and resources needed for process assessment. The overall architecture and content of these documents is described in ISO/IEC 33001. Several documents on process assessment developed by JTC 1/SC 7 are intended to replace and extend parts of the ISO/IEC 15504 series.

The published documents on process assessment by JTC 1/SC 7 for systems and software life cycle processes do not provide a sufficient basis for performing a process quality assessment with respect to the development of complex safety-related systems.

Developing safety-related systems requires specialized processes, techniques, skills, and experience. Additional processes are needed in the area of safety management, safety engineering and external resource qualification. This document presents three process descriptions: safety management, safety engineering and external resource qualification processes.

A process assessment model is related to one or more process reference models. The extended safety process reference model is included in this document as descriptions of process purposes and outcomes.

A process assessment model incorporates a process measurement framework conforming to the requirements of ISO/IEC 33003 and is expressed as a process quality characteristic with a defined set of process attributes.

A process assessment model includes a set of assessment indicators. Process performance indicators address the process purpose and outcomes of each process in the process assessment model. Process quality indicators demonstrate the achievement of the process attributes in the process measurement framework. These indicators may also provide a reference source of practices when implementing a process improvement program.

The assessment indicators are used as a basis for collecting objective evidence to support an assessor’s judgement in assigning ratings of the performance and quality of an implemented process. The set of indicators defined in this document are not intended to be an all-inclusive set and applicable in its entirety. Subsets appropriate to the context and scope of the assessment should be selected and potentially augmented with additional indicators.

A process assessment is conducted according to a documented assessment process. A documented assessment process identifies the rating method to be used in rating process attributes and identifies or defines the aggregation method to be used in determining ratings.

ISO/IEC 33020 provides a process measurement framework for the assessment of process capability which may be incorporated as a process measurement framework in this document. ISO/IEC 33020:2019, Annex B includes a set of process quality indicators for each process attribute in the process measurement framework.

1 Scope

This document defines a process assessment model for safety processes, conforming to the requirements of ISO/IEC 33004, for use in performing a process assessment in accordance with the requirements of ISO/IEC 33002.

This document supports the use of the process assessment models for system and software life cycle processes (ISO/IEC TS 33060 and ISO/IEC TS 33061) when applied to assessment of processes in the development of (functional or non-functional) safety related systems in order to make consistent judgment regarding either process quality or improvement priorities, or both.

2 Normative references

3 Terms and definitions

4 The process assessment model

4.1 General

4.2 Structure of the process assessment model

4.3 Assessment indicators

5 The process dimension

5.1 General

5.2 Safety processes (SAF)

6 The quality dimension

Bibliography

PD ISO/IEC TS 33064:2025

Information technology. Process assessment. Process assessment model for safety processes

Current

Published:

31 Oct 2025