EVIDENCE ABOUT THE CONSTRUCT VALIDITY OF PRESUMED VOCATIONAL MATURITY FACTOR SCORES WAS OBTAINED BY STUDYING THE RELATIONSHIP BETWEEN FACTORS OF VOCATIONAL MATURITY AND A GROUP OF CONCURRENT VARIABLES DEEMED RELEVANT TO VOCATIONAL MATURITY. THESE VARIABLES WERE CLASSIFIED INTO FIVE GROUPS--FAMILY SOCIOECONOMIC STATUS, ABILITY AND ACHIEVEMENT, VOCATIONAL ASPIRATION, PARTICIPATION, AND DESCRIPTION. SCORES ON EACH VARIABLE WERE OBTAINED FOR THE SAME 103 BOYS IN BOTH THE NINTH AND 12TH GRADES. SCORES WERE CORRELATED AT EACH OF THE GRADE LEVELS WITH SOME VARIABLES TREATED AS CONTINUOUS MEASURES AND OTHERS DICHOTOMIZED. COEFFICIENTS OF CORRELATION BETWEEN THE VARIOUS TYPES OF MEASURES WERE COMPUTED. FACTOR SCORES WERE OBTAINED FOR EACH BOY AT BOTH GRADE LEVELS, AND THE SCORES ON EACH FACTOR WERE CORRELATED WITH THE SCORES ON EACH VARIABLE. A GENERAL DISCUSSION OF THE RESULTS IS PROVIDED. "OCCUPATIONAL INFORMATION--TRAINING AND EDUCATION REQUIREMENTS" APPEARS AS AN ADEQUATE MEASURE FOR NINTH AND 12TH GRADES. "CONSIDERATION OF OCCUPATIONAL ALTERNATIVES AND CONTINGENCIES" APPEARS AS AN ADEQUATE 12TH-GRADE MEASURE. TABLES CONTAIN VARIABLE MEASURE INFORMATION AND CORRELATION DATA. THIS PAPER WAS PRESENTED TO SESSION 177 OF THE AMERICAN PERSONNEL AND GUIDANCE ASSOCIATION CONVENTION (WASHINGTON, D.C., APRIL 5, 1966). (PS)