RES76 – 217 – 2 to continue its studies and to develop a Recommendation on the accurate modelling of interference from non-GSO FSS systems into GSO FSS and GSO BSS networks in the frequency bands referred to in considering a) above, in order to assist administrations planning or operating non-GSO FSS systems in their efforts to limit the aggregate epfd levels produced by their systems into GSO networks, and to provide guidance to GSO network designers on the maximum epfd levels expected to be produced by all non-GSO FSS systems when accurate modelling assumptions are used; 3 to develop a Recommendation containing procedures to be used among administrations in order to ensure that the aggregate epfd limits given in Tables 1A to 1D are not exceeded by operators of non-GSO FSS systems; 4 to attempt to develop measurement techniques to identify the interference levels from non-GSO systems in excess of the aggregate limits given in Tables 1A to 1D, and to confirm compliance with these limits, instructs the Director of the Radiocommunication Bureau 1 to assist in the development of the methodology referred to in invites the ITU Radiocommunication Sector 1 above; 2 to report to a future competent conference on the results of studies in invites the ITU Radiocommunication Sector 1 and 3 above.