Editorial Note: In 1931 the CIE (Commission Internationale de l'Eclairage, or International Commission on Illumination) issued an historic set of standards on illumination and colorimetry. In the late 1940's it was becoming apparent that serious consideration needed to be given to a revision of some of the standards. Since then there has been persistent thought given to the revision of the concepts, terminology, testing procedures, etc., and from time to time some changes have been effected. The report herewith covers revisions for an international terminology.