This supplement gives general guidance on the specification and execution of interoperability tests for communication systems. Itprovides a framework within which interoperability test specifications for a wide range ofproduct types can be developed. The guidelines are expressed as recommendations rather than strict rules and leave enough freedom to allow test specifiers toadopt and adapt processes to suit each particular project while still ensuring that test specifications accurately reflect the requirements of the base standards and can be executed consistently across a range of configurations.