THE EFFECT OF CHILDREN'S ACHIEVEMENT AND SOCIAL AND PERSONAL ADJUSTMENT UNDER A PROGRAM OF ADAPTED INSTRUCTION WAS INVESTIGATED. A SAMPLE INVOLVING ABOUT 700 STUDENTS WITH 30 DIFFERENT TEACHERS WAS USED. METHODS OF DIFFERENTIATED INSTRUCTION WERE PRESENTED TO THE TEACHERS IN A 3-DAY WORKSHOP TO THE OPENING OF SCHOOL. SUCH METHODS CONSISTED OF (1) ADJUSTMENTS TO ABILITY LEVEL, (2) ADJUSTMENTS TO LEARNING RATES, (3) SPECIAL SKILLS NEEDED, (4) SELF-DIRECTION AND SOCIAL LEARNING, AND (5) ENRICHING LEARNING AND MAKING IT SIGNIFICANT. ALL TEACHERS IMPROVED THEIR TECHNIQUES OF ADAPTING INSTRUCTION TO THE VARYING NEEDS OF CHILDREN. SCHOOL SUBJECTS DIFFERED IN THEIR ADAPTABILITY TO INDIVIDUALIZED PROGRAMS OF INSTRUCTION. THE PROGRAM RESULTED IN SIGNIFICANT IMPROVEMENTS IN ACHIEVEMENT IN GRADES 5 AND 6, BUT NOT IN GRADE 4. (TC)