Abstract
Abstract Over a period of about eight years the International Organization for Standardization (ISO) developed and standardized a testing methodology and framework for testing protocol implementations for conformance to OSI standards. As part of that work, a standardized test notation, the Tree and Tabular Combined Notation (TTCN), was developed and used for precise specification of abstract test suites. This paper explains and illustrates, using X.25 examples, the basic concepts of TTCN in the context of the standardized OSI conformance testing methodology and framework (ISO IS 9646). A brief description of the most recent work on enhancements to TTCN and examples of widely available TTCN tools are also presented.
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