ASTM Committee E33 on Building and Environmental Acoustics was formed in 1972. E33 meets twice a year, usually in April and October, with approximately 40 members attending two days of technical meetings. The committee, with a membership of about 140, currently has jurisdiction of over 50 standards, published in the Annual Book of ASTM Standards, Volume 04.06. E33 has 8 technical subcommittees that maintain jurisdiction over these standards. Information on this subcommittee structure and E33's portfolio of approved standards and Work Items under construction are available from the Lists of Subcommittees, Standards and Work Items below. These standards have and continue to play a preeminent role in determining the characteristics and performance of materials, products, systems and services relating to the acoustical environment.