This Recommendation gives guidance on the concepts of Implementation Conformance Statements (ICSs) and System Conformance Statements (SCSs) related to OS1 specifications and specifies requirements and gives guidance on the production of ICs, ICs proformas, ICs templates and profile Requirements Lists (RLs). This Recommendation 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.