This study formulates a general semantics theory of societal cohesion, and tests the extent to which general semantics instruction in public schools can alter group attitudes in the directions suggested by the theory. The test instrument, which consists of measurable elements, rationality, acceptance of change, nonprejudice, and nonauthoritarianism, was administered to two experimental and two control groups of high school juniors and seniors. The group studying general semantics did much better in their measured rationality and nonauthoritarianism than did the control groups. Results of the study reveal that: (1) the four-decade-old Korzybskian framework is still applicable to modern issues; (2) the cohesion model within which the United States historically operated is no longer the most functional one available; (3) the one cohesion model for contemporary American society is based on general semantics principles; (4) rationality and nonauthoritarianism can be increased through general semantics education; and (5) widespread utilization of semantics in public schools is recommended. (Author/SW)