The "XM Ready" certification type approval testing program was implemented by XM to verify XM capable products conformance to the XM specification and to verify proper functionality of these devices. Under this program, different vendors can submit their XM products for certification testing once they have ran their own self testing to insure that their products are ready for submission. Once vendors have established a certain level of confidence, they can then submit their products to the test house for the actual certification testing.
Upon completion of testing, reports are generated and submitted to the vendors as well as to the XM personnel. The actual XM TA "XM Ready" certification will be issued by XM if the certification testing was a success. If the testing was a failure, vendors are expected to resolve the product's issues and re-submit for testing (with a new firmware upgrade, for example) with fixes to the reported issues.
XM certification is yet another example of the "Trust, but Verify" mantra of certification programs.