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Information technology. Open systems interconnection. Conformance testing methodology and framework - The Tree and tabular combined notation (TTCN) has-corrigendum BS EN 1022 has been1 Scope 1. 1 This part of ISO IEC 9646 defines an informal test notation, called the Tree and Tabular Combined Notation (TTCN), for OSI conformance test suites, which is independent of test methods, layers and protocols, and which reflects the abstract testing methodology defined in ISO IEC 9646 1 and ISO IEC 9646 2.