Nearly 15 years after the last commercial supersonic flight, the quick evolution of technology combined with the emergence of ambitious industrial projects indicates that a second era for environmentally-friendly supersonic passenger flights is at the horizon. However, one of the main obstacles remaining on the path towards sustainable supersonic flights is the issue of noise, specifically the loud and sudden sonic boom felt by the populations overflown during the entire cruise. The RUMBLE project is dedicated to the production of the scientific evidence requested by national, European and international regulation authorities to determine the acceptable level of overland sonic booms and the appropriate ways to comply with it. The project will develop and assess sonic boom prediction tools, study the human response and validate its findings by wind-tunnel experiments and flight tests. RUMBLE will also pave the way for a future low boom flying demonstrator. RUMBLE will associate the leading organisations in supersonic aviation in Europe and Russia, combining scientific excellence, world-class research infrastructures and industrial leadership bearing the heritage from Concorde and Tu-144, with strong involvement in the regulatory bodies. RUMBLE will provide the necessary data and procedure for a future internationally-agreed standard on low-sonic-boom supersonic flights overland. This standard will help protect European citizens' quality of life by guaranteeing, in agreement with the International Civil Aviation Organization's (ICAO) general resolution 33-7, that no unacceptable situation is created by supersonic commercial flights.