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INTRODUCTION In 2005 a joint working party (JWP) of independent experts drawn from the International Union of Pure and Applied Chemistry (IUPAC) and the International Union of Pure and Applied Physics (IUPAP) was appointed by the Presidents of the Unions to determine priority of claims to the discovery of elements with atomic numbers greater than 111. This JWP considered literature and documentation submitted to it by 30 June 2007. Its consideration of these data was carried out in accordance with the criteria for the discovery of elements previously established by the 1992 IUPAC/IUPAP Transfermium Working Group [1-3] and reinforced in subsequent IUPAC/IUPAP JWP discussions. The group decided to report first  on the discovery of element with atomic number 112. Prior to its publication, this report was sent to each of the claimant laboratories to be checked for technical accuracy. It was also reviewed by the requisite number of independent expert referees, and its findings were accepted by the Executive Committees of the two Unions and by the Division Committee of the IUPAC Inorganic Chemistry Division. The JWP will issue its second report, dealing with claims for the discovery of elements with atomic numbers in the range 113-118, in the near future.