SYSTEMS OF EXCHANGE - USING THE EXTINCTION, DISTRACTION, AND SUBSTITUTION EFFECTS SYSTEMS - WERE IMPLEMENTED TO DECREASE AGGRESSION AND PROMOTE COOPERATION AND SCHOLARLY BEHAVIOR, THREE SYSTEMS WERE TESTED USING EXCHANGE THEORY AS A GUIDE. THE SUBJECTS WERE FIVE 4- AND 5-YEAR-OLD BOYS DIAGNOSED AS HYPERAGGRESSIVE. EXPERIMENTAL CONDITIONS INCLUDED (1) THREATS AND PUNISHMENT BY THE TEACHER TO LOWER THE RATE OF AGGRESSION, (2) IGNORING ACTS OF PROVOCATION AND NOT RECIPROCATING WITH ATTENTION, AND (3) RECIPROCATING WITH ATTENTION, APPROVAL, AND TOKENS. THE MEASUREMENT APPARATUS CONSISTED OF TWO UNITS--(1) AN ESTERLINE ANGUS EVENT RECORDER AND (2) AN OPERATING PANEL WITH 20 BUTTONS. DIRECT OBSERVATIONS WERE ALSO EMPLOYED. GENERALLY, THE RESULTS SUGGESTED THAT THE RATE OF AGGRESSION WAS PROPORTIONAL TO THE REINFORCING VALUE OF THE TEACHER'S RECIPROCATION IN THE EXCHANGES SHE ESTABLISHED IN THE CLASSROOM. CONCLUSIONS WERE THAT THE TEACHER'S AUTHORITY IN THE CLASSROOM DEPENDED ENTIRELY ON WHAT SHE EXCHANGES AND HOW SHE LEARNS TO PROGRAM THOSE EXCHANGES. (RS)