The ITU Radiocommunication Assembly considering that 16:9 wide-screen television receivers are increasingly being made available to the public in 525-line and 625-line countries. The advent of a wide-screen receiver market is leading programme producers to consider the production aspects of wide-screen programmes that will be shown on 4:3 displays as well as 16:9 displays; that provision for a common system for optimizing the display of the original programme material on a suitably equipped 16:9 display device would be a valuable enhancement to the service provided, together with the means to make appropriate automatic arrangements for any subtitling; that there would be benefits for multi-standard receivers and, recorders, and costs, if a unique signalling system were used for all television standards.