Recommendation ITU-T X.902 | ISO/IEC 10746-2 contains the definition of the concepts and analytical framework for normalized description of (arbitrary) distributed processing systems. It introduces the principles of conformance to ODP standards and the way in which they are applied. This is only to a level of detail sufficient to support Recommendation ITU-T X.903 | ISO/IEC 10746‑3 and to establish requirements for new specification techniques.