This Recommendation defines a support service to be used in telecommunications performance management (PM) based on CORBA. It defines in Interface Definition Language (IDL) a set of interfaces in both fine-grained and facade version, data types, and constants. The intent of this Recommendation is to define a CORBNIDL specification similar to that defined in ITU-T Recs. X.739 and Q.822 using CMISE. This Recommendation is compliant with proposed COBA modelling standards in ITU-T Recs. X.780, X.780.1,Q.816, Q.816.1 and M.3120.