This Recommendation defines an information model to be used in telecommunications performance management (PM) based on CORBA. It defines in Interface Definition Language (IDL) a set of interfaces, notifications, and constants. The intent of this Recommendation is to define a CORBA/IDL model similar to that defined in ITU-T Recs. X.739 and Q.822 using CMISE. This Recommendation is compliant with CORBA modelling standards in ITU-T X.780, X.780.1, Q.816, Q.816.1 and M.3120.