This part of ISO/IEC 15504 is a safety extension that defines additional processes and guidance to support the use of the exemplar process assessment models for system and software (ISO/IEC 15504-5 and ISO/IEC TR 15504-6) when applied to assessment of processes in the development of (functional or non-functional) safety-related systems in order to make consistent judgment regarding process capability and/or improvement priorities. This part of ISO/IEC 15504 is not intended to provide the state of the art for developing or verifying functional or non-functional safety-related systems or components. NOTE The aim of this part of ISO/IEC 15504 is not to provide a way to verify the compliance with one or more domain-specific safety standards, nor to extend ISO/IEC 15504 in order to use it as a safety standard against which to verify compliance. The aim is to provide assessors with the necessary means and information for measuring the capability of processes and also defining possible process improvement actions when the software/system under development is safety-related.