Recommendations ITU-T J.207 and ITU-R BT.2075 provide guidance information for Integrated Broadcast-Broadband (IBB) service providers to select IBB systems for their use. In general, IBB systems comprise of various hardware and software components, and tailoring them for the specific IBB system leads to extensive development by manufacturers. On the other hand, in order to deploy the services in a wider area, IBB service providers need to develop their IBB applications for each IBB system if the operators or broadcasters on which the service providers intend to deploy their services use a different IBB system from the system on which the services are originally deployed. Thus, it is beneficial for both IBB service providers and manufacturers of IBB capable reception devices such as STBs to harmonize IBB systems. It should also be considered that the use of companion devices is already a part of IBB services. In addition, information on IBB application environment to implement an IBB application software for other IBB systems is useful to deploy the same service on different IBB systems. Based on the ideas above, this Recommendation is intended to define methods for harmonization of IBB systems and/or their application environment by identifying commonalities across IBB systems and maximizing portability of IBB applications.