In the first surge of the mathematics content reform, many new topics were considered and incorporated into the elementary school curriculum. Algebraic ideas and the structure of the number system were given considerable emphasis. In the process, the elder brother of these topics, geometry, was often shelved or merely passed over. Today there is renewed interest in the teaching of geometry in the elementary grades. This concern has been adequately reflected in recent issues of The Arithmetic Teacher. (See the October 1966, February and October 1967, December 1968, and October 1969 issues.)
The Teaching Content Reform for Information and Communication Engineering Graduate Degree Course “Broadband Mobile Communication Networks” Based on Knowledge System Construction