Specifies the requirements and gives guidance for the production of system-independent conformance test suites for one or more OSI specifications. In particular, it is applicable to the production of all OSI conformance testing specifications including all draft versions of such conformance testing specifications. Applicable to the production of abstract test cases which check the conformance of an implementation to the relevant static and/or dynamic conformance requirements by controlling and observing protocol behaviour. Applicable to the production of test suites for testing implementations of one or more adjacent protocols, whether or not these are embedded under other protocols. NOTE - This part of ISO/IEC 9646 applies fully to some but not all Physical layer protocols.