This Recommendation defines a set of TMN CORBA managed object and fašade object modelling guidelines required to support service-oriented interfaces. It specifies how service-oriented CORBA TMN interfaces are to be defined. It covers IDL repertoire, information modelling in IDL and IDL style conventions. It also provides guidelines on redesigning fine-grained and coarse‑grained interfaces to service-oriented interfaces. An IDL module is provided defining basic data types, exceptions, notification constructs, a base CORBA struct to be included by every service‑oriented managed object and a base CORBA interface to be inherited by every service‑oriented CORBA interface. This Recommendation and ITU-T Recommendation Q.816.2 together compose a framework for CORBA-based service-oriented TMN interfaces with a wide range of applications.