This document is a key output of the SAFE-6G project, titled "A Smart and Adaptive Framework for Enhancing Trust in 6G Networks." It focuses on the definition and validation methodology for Key Performance Indicators (KPIs) and Key Value Indicators (KVIs), ensuring the effective measurement and assessment of trust, security, privacy, resilience, and reliability in future 6G networks. The work presented here aligns with the objectives outlined in the project's Grant Agreement (101139031) and contributes to the European Commission's vision of secure, efficient, and user-centric next-generation communication infrastructures. The document provides a structured approach to defining KPIs and KVIs at three levels—network, service, and societal. These indicators serve as the foundation for evaluating the technical and operational performance of 6G networks while also integrating broader socio-economic considerations. The methodology for KPI selection and validation draws upon insights from standardization bodies such as ITU, ETSI, and 3GPP, as well as findings from parallel 6G initiatives within the SNS Stream B and C projects and the 5GPPP Technology Monitoring and Validation Working Group (TMV WG).