The Executive and Liaison Committee of the Universal Postal Union (UPU) met at Berne from May 5 to 16, 1958. After the rules of procedure for the work and deliberations of the Committee had been discussed and approved, the Committee considered the tasks which had been entrusted to it by the UPU Congress. These tasks had been classified into two groups. The first group included the study of various proposals, the solutions of which might be sought by the International Bureau. The second group comprised ten problems, among which were the following: perusal of the examination of the Universal Postal Convention's general structure; determination of the methods to be followed in order to execute the accepted principle of the incorporation of the air mail provisions into the Convention in the form of a special chapter; continuation of work on the multilingual vocabulary for the international postal service; and continuation of work on universal decimal classification. The Committee decided to entrust each one of these tasks to a separate subcommittee. Thus it reconstituted the three subcommittees (air mail, multilingual vocabulary, decimal classification) which had already worked under the former Executive Committee and set up seven new subcommittees. The air mail subcommittee proposed that the Executive Committee should take action regarding an International Civil Aviation Organization request for the collaboration of UPU in the collection of the information necessary for the study which it intended to undertake concerning commercial rights in the transport of international air mail.