INSTRUCTIONAL MATERIALS IN MATHEMATICS WERE DEVELOPED ACCORDING TO DESIRED BEHAVIORAL OUTCOMES AND DEMONSTRATED AT A SUMMER, INSERVICE TEACHER EDUCATION PROGRAM. PROJECT STAFF MEMBERS WERE PRESENTED WITH AN AUDIOVISUAL AND SUPPLEMENTAL READING PROGRAM TO ORIENT THEM TO A BEHAVIORAL OUTCOME APPROACH TO INSTRUCTION. BEFORE THE INSTRUCTIONAL MATERIALS WERE DEVELOPED, EACH STAFF MEMBER WAS TAUGHT TO MAKE A BEHAVIORAL DESCRIPTION, TO CONSTRUCT A BEHAVIORAL HIERARCHY OR SEQUENCE OF DEPENDENT BEHAVIORS INTENDED TO OPTIMIZE ACQUISITION, AND TO CONSTRUCT BEHAVIORAL OBJECTIVES. THOSE BEHAVIORAL OBJECTIVES OR TERMINAL TASKS WHICH WOULD HAVE THE HIGHEST YEILD FOR INSERVICE ELEMENTARY TEACHER INSTRUCTION WERE SUBSEQUENTLY CHOSEN. AFTER A HIERARCHY WAS CONSTRUCTED, THE INSTRUCTIONAL SEQUENCE WAS DETERMINED BY BEGINNING WITH THE LEAST COMPLEX BEHAVIORS IN THE HIERARCHY, DESIGNING INSTRUCTIONAL MATERIALS TO HELP THE LEARNER ACQUIRE THE SPECIFIC BEHAVIORS, AND REPEATING THE PROCESS UP THROUGH THE SEQUENCE UNTIL THE TERMINAL TASK WAS REACHED. TWO EXPERIMENTAL EDITIONS OF THE DEVELOPED MATERIALS WERE TESTED ON A PILOT BASIS. THE SECOND EDITION, A REVISION OF THE FIRST, RAISED THE LEVEL OF ACQUISITION OF DATA ON ALGORITHMS MORE THAN 50 PERCENT, INDICATING THAT THE TEACHERS DEMONSTRATED SUBSTANTIAL PROGRESS TOWARD ACQUIRING THE DESIRED BEHAVIORS. BOTH EXPERIMENTAL EDITIONS OF THE DEVELOPED INSTRUCTIONAL MATERIALS ON ALGORITHMS WERE APPENDED TO THE REPORT. (GD)