Organized on 10 October 1916 to established standard magnifications for micrographs, Committee E4 has branched out into many different areas, far beyond its initial scope, in the process producing forty-two standards, twenty-five STPs (this is the twenty-fifth), five ASTM presidents, two other ASTM Committees, and the Joint Committee on Powder Diffraction Standards. The committee has met 138 times, not counting separate task group meetings. ASTM E4 standards are used by many other countries, either in full, or in part. As with all ASTM committees, E4's members are volunteers. Whatever success E4 has had is due to these volunteers and the support of their organizations.