A FOLLOWUP STUDY WAS REPORTED THAT ENLARGED THE SCOPE OF THE AUTHOR'S PREVIOUS STUDY OF THE OPPOSITE-FORM APPROACH USED BY STUDENTS IN TEST AND MEASUREMENT COURSES. THE STUDY HAD THREE PURPOSES--(1) TO INVESTIGATE THE RELIABILITIES OF OPPOSITE-FORM INVENTORIES, (2) TO CROSS VALIDATE OPPOSITE-FORM INVENTORIES, AND (3) TO STUDY THE PATTERNING OF EXTERNAL VALIDITY OF THE OPPOSITE-FORM APPROACH. THE FOLLOWUP STUDY ADDED INFORMATION ON THE TEST-RETEST RELIABILITY OF THE OPPOSITE-FORM APPROACH AND SHOWED ITS VALUE AND PRACTICAL SIGNIFICANCE TO PERSONALITY INVENTORIES IN AN INVESTIGATION OF THE PATTERNING VALIDITY USING A PRACTICAL EDUCATION CRITERION (COURSE GRADE). SUBJECTS CONSISTED OF 96 MALE AND 95 FEMALES, A TOTAL OF 191 FRESHMEN, SOPHOMORES, AND JUNIOR COLLEGE STUDENTS ENROLLED IN PSYCHOLOGY CLASSES. FIVE INVENTORIES WERE GIVEN IN FOUR SETTINGS, EACH ABOUT 2 DAYS APART. THE IMPLICATION OF THE RESULTS WAS THAT THE CORRELATION OR PREDICTION OF AN EDUCATION CRITERION IS JUST AS EFFECTIVE IN USING THE OPPOSITE FORMS OF AN INVENTORY AS IN THE ORIGINAL. (AL)