This Recommendation specifies the requirements and gives guidance for the production of system-independent conformance test suites for one or more OS1 specifications. In particular, it is applicable to the production of all OSI conformance testing specifications including all draft versions of such conformance testing specifications. This Recommendation is 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. The Abstract Test Methods included in this Recommendation are, in fact, capable of being used to specifjany test case which can be expressed abstractly in terms of control and observation of Protocol Data Units (PDUs) andAbstract Service Primitives (ASPS). Nevertheless, for some protocols, test cases may be needed which cannot be expressed in these terms. The specification of such test cases is outside the scope of this Recommendation, although the test cases may themselves need to be included in a conformance testing specification.