Although devoting its attention primarily to preparatory work for the Second Assembly of the International Civil Aviation Organization, the ICAO Council during its third session also approved the first sets of International Standards and Recommended Practices designed to produce uniform operation of international air transport. The standards, which were the results of studies conducted by the organization since its inception in 1944, dealt with personnel licensing, rules of the air, meteorological codes, aeronautical charts, and dimensional units to be used in air-ground communications. The Council asked that all member states incorporate the Standards into their national legislation as nearly as possible in the exact terminology used by ICAO, giving the closest possible approach to absolute uniformity.