Recommendation ITU-T H.820 provides a top-level overview of the test specifications and test profiles used to verify product conformance to the Continua Design Guidelines (CDG) that are defined in the Recommendations of the ITU-T H.810 sub-series, of which Recommendation ITU‑T H.810 (2017) is the base Recommendation. It outlines the scope of the conformance and interoperability tests, test suite structures (TSS) and test purposes (TP), the test case reference list and the Continua test tool, which in turn are specified in detail in the Recommendations of the ITU‑T H.820-H.850 series.