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Membership / Committee Structure Alphanumeric Committee Listing Each technical committee in ASTM has the same basic 3-tiered structure (i.e. main committee, subcommittees, and task groups) as indicated by the diagram below. Each main committee is a semiautonomous group approved by the ASTM Board Each main committee is divided into multiple subcommittees that address specific subjects or areas within the scope of the main committee ñ these areas include Main Committee Subcommittees Task Groups All ASTM committees are led by members who have been elected to serve as officers. There are four main committee officer positions that are common to virtually every ASTM committee ñ Chairman, Vice-Chairman, Secretary, and Membership Secretary (for a description of the duties and responsibilities for these offices, please refer to the Technical Committee Officer Handbook). At the subcommittee level, a Chairman (and occasionally a Vice-Chairman or Secretary), is appointed by the leadership of the main committee. | ||