One of the missions of California Community Colleges (CCCs) is to provide career and technical education (CTE) to students that will prepare them for the workforce. Major funding for CTE programs comes from grant monies that are tied to the condition that institutions must demonstrate an effort to increase the participation and completion rates of students who are preparing to work in nontraditional careers (i.e., careers in which their gender comprises less than 25% of the labor force). The present study applied the principles of the Theory of Planned Behavior (TPB) to design an intervention to address participation and completion in nontraditional programs at a medium-sized CCC in southern California. Two hundred twenty-nine CCC students participated in the study, 117 experienced an intervention and 112 received no intervention. A multivariate analysis of covariance (MANCOVA), followed by univariate analyses of covariance (ANCOVA), revealed that, controlling for pretest measures, gender of participant, and the gender by study condition interaction, participants in the treatment group reported more positive posttest attitudes ( p = 0.002, d = 0.42) and subjective norms (p = 0.025, d = 0.31; although the effect was marginal) than participants in the control group. In addition, controlling for pretest measures, study condition, and the gender by study condition interaction, females reported marginally higher behavioral intentions than males at posttest (p = 0.053, d = 0.29). Tests of the relationships between cognitive antecedents to behavior and behavioral intentions revealed that subjective norms (sr[superscript 2] = 0.038, p < 0.001) and attitudes (sr[superscript 2] = 0.008, p = 0.04) both uniquely accounted for a significant portion of the explained variance in behavioral intentions, but perceived control did not. Moreover, subjective norms explained more variance in behavioral intentions than either attitudes or perceived control. Finally, a test of delayed effects of the intervention on treatment participants revealed that while an immediate positive change in attitudes was evident at posttest (M[subscript diff] = 0.41, p < 0.001), the effect had worn off at the delayed posttest nine weeks later (M[subscript diff] = 0.09, p = 0.46). [The dissertation citations contained here are published with the permission of ProQuest LLC. Further reproduction is prohibited without permission. Copies of dissertations may be obtained by Telephone (800) 1-800-521-0600. Web page: http://www.proquest.com/en-US/products/dissertations/individuals.shtml.]