Reviews the position of CISPR limits for the protection of telecommunications from interference from ISM equipment, clarifies the roles of the CCIR and the CISPR in their collaboration in studies on the limits required for this purpose, summarizes the various proposals for methods of specifying limits and derives from these a recommended method which will meet the objectives of CISPR and CCIR. Deals only with radiation which occurs outside the bands designated by ITU for ISM use and does not include consideration of data-processing equipment.