Administered a 122-item instrument measuring attitudes, study habits, and motivation, to 509 male and 529 female junior high school students and the interitem correlation matrices were factor analyzed. Factor scores were used to predict subsequent scores on 6 Metropolitan Achievement Test subtests. The multiple correlations ranged from .484-.593 for males (n = 428) and from .625-.689 for females (n = 456). The affective predictors significantly increased (p < .01) the multiple correlations for males when they were used in conjunction with aptitude scores on the School and College Ability Test. For females, 3 multiple correlations increased at p < .01 and 2 at p < .05 when affective predictors were added to the aptitude battery. Canonical correlations for .687 and .785 (p < .01) were obtained for males and females, respectively, between the linear composites of affective and achievement variables. (22 ref.) (PsycINFO Database Record (c) 2006 APA, all rights reserved). © 1969 American Psychological Association.