1. ETSI Standard ES 201 873-1 V3.2.1 (2007–02): The Testing and Test Control Notation version 3; Part 1: TTCN-3 core language. European Telecommunications Standards Institute (ETSI), Sophia-Antipolis, France (2007)
2. ISO/IEC Standard No. 9126: Software engineering—product quality; Parts 1–4. International Organization for Standardization (ISO)/International Electrotechnical Commission (IEC), Geneva, Switzerland (2001–2004)
3. ISO/IEC Standard No. 9646, Part 3: Information technology—open systems interconnection—conformance testing methodology and framework—Part 3: The Tree and Tabular Combined Notation (TTCN). International Organization for Standardization (ISO)/International Electrotechnical Commission (IEC), Geneva, Switzerland (1998)