THIS STUDY WAS DONE TO DETERMINE THE PREDICTIVE VALUE OF INDIVIDUAL AND GROUP ACHIEVEMENT TESTS WHEN USED TO EVALUATE DEAF CHILDREN. THE 36 CHILDREN SELECTED FOR THIS STUDY WERE IN GRADES 2, 4, AND 6 IN THE KENNEDY SCHOOL IN DAYTON, OHIO. ALL HAD SEVERE AUDITORY HANDICAPS AND WERE 10 TO 16 YEARS OLD. FOUR PSYCHOLOGISTS ADMINISTERED THE FOLLOWING TESTS--(1) LEITER INTERNATIONAL PERFORMANCE SCALE (LIPS), (2) GREY STANDARDIZED ORAL READING PARAGRAPHS, (3) BENDER VISUAL-MOTOR GESTALT, (4) WECHSLER INTELLIGENCE SCALE FOR CHILDREN (WISC) PERFORMANCE SCALE, (5) WIDE RANGE ACHIEVEMENT TEST (WRAT), AND (6) KNOX CUBE TEST FROM THE GRACE ARTHUR PERFORMANCE SCALE. ALL CHILDREN WERE ALSO GIVEN THE METROPOLITAN ACHIEVEMENT TEST (MAT), FORM B (1959). THE BENDER GESTALT RESULTS WERE DISCARDED FOR NONRELEVANCY TO THE FACTORS UNDER STUDY. RESULTS INDICATED THAT (1) THE LEITER IQ SCORE WAS 15 TO 20 POINTS LOWER THAN THE WISC PERFORMANCE IQ SCORE (79-06), (2) THE GROUP APPEARED TO BE 3 YEARS OVERAGE FOR THEIR ACTUAL GRADE PLACEMENT BASED ON MAT SCORES. THE PEARSON PRODUCT MOMENT COEFFICIENT OF CORRELATION REVEALED SIGNIFICANT CORRELATIONS BETWEEN--(1) LEITER AND GROUP READING TEST SCORES (.01 LEVEL), (2) KNOX CUBE, WITH INDIVIDUAL READING (.01 LEVEL), (3) LEITER WITH THE INDIVIDUAL READING SCORES (.01 LEVEL), (4) LEITER AND WISC PERFORMANCE (.01), AND (5) WISC PERFORMANCE SCALE AND INDIVIDUAL READING (.05 LEVEL). IN THE THIRD ANALYSIS OF DATA, MULTIPLE CORRELATIONS USING AIKEN'S NUMERICAL SOLUTION OF REGRESSION ARE PRESENTED TABULARLY. SOME CONCLUSIONS ARE (1) THE LEITER MENTAL AGE GRADE PLACEMENT SCORE IS THE SINGLE BEST PREDICTOR OF SUCCESS IN THE LANGUAGE ARTS FOR DEAF CHILDREN IN THE ELEMENTARY GRADES, (2) THE KNOX CUBE RAW SCORE IS THE SINGLE BEST PREDICTOR OF SUCCESS IN THE DEVELOPMENT OF WORD RECOGNITION SKILLS AND ORAL LANGUAGE IN DEAF CHILDREN IN THE ELEMENTARY GRADES, AND (3) A COMPLETE EVALUATION SHOULD INCLUDE THE LEITER, KNOX CUBE, AND WISC PERFORMANCE SCALES. (RS)