Recommendations X.290 to X.296 specify a general methodology for testing of products to ITU-T Recommendations or International Standards that specify OS1 protocols which the products are claimed to implement. The methodology applies to testing conformance to the specification of an OS1 protocol; the specification of a transfer syntax used in combination with a specific OS1 protocol; the specification of an OSI protocol profile, including the testing of conformance to any specified information objects used in combination with one or more of the protocols, as specified in the profile; the specifications of a combination of OS1 protocols, possibly used in combination with a specified transfer syntax andor one or more specified information objects.