This part of ISO/IEC 9646 gives guidance on the concepts of Implementation Conformance Statements (ICSs) and System Conformance Statements (SCSs) related to OSI specifications and specifies requirements and gives guidance on the production of ICSs, ICS proformas, ICS templates and profile Requirements Lists (RLs). This part of ISO/IEC 9646 specifies for these documents, the structure, the questions to be asked, the syntax and notation to be used and the semantics of the questions and expected answers. No generic ICS template is provided because of the wide variety of OSI specifications for which conformance requirements are stated. Nevertheless, this part of ISO/IEC 9646 specifies general requirements that are applicable to any OSI specification. Other than guidance on the relation between an ICS and Implementation eXtra Information for Testing (IXIT), requirements and guidance on IXIT are outside the scope of this part of ISO/IEC 9646.