The present document specifies requirements and guidance for the assessment of a Trust Service Provider (TSP) through the Conformity assessment against an ETSI document specifying policy and security requirements for a particular class of trust service (e.g. policy requirements for certification authorities issuing qualified certificates as in TS 101 456 [i.3]). Requirements and guidance set out in the present document are independent of the class of trust service provided. Other documents may extend or refine the requirements specified in the present document to provide requirements and/or guidance for a particular class of service.