ASTM Committee D31 on Leather was formed in 1971. D31 meets twice a year, usually in April and October, with about 20 members attending two days of technical meetings. The Committee, with a current membership of approximately 50, has jurisdiction over 126 standards, published in the Annual Book of ASTM Standards, Volume 15.04. D31 has 8 technical subcommittees that maintain jurisdiction over these standards. Information on this subcommittee structure and D31's portfolio of approved standards and Work Items under development are available from the List of Subcommittees and Standards. These standards have and continue to play a preeminent role in all aspects important to the industry including: properties, classification, nomenclature, analysis, quality assurance and end-use performance requirements.