Student teachers in their final year of college preparation enter a profession that is facing a severe shortage and an alarming rate of attrition. Novice teachers, those with five or fewer years of experience, are faced with myriad challenges that makes retention a problem for the colleges preparing them, the school districts that hire them, and the students that need them in their classrooms. This mixed methods action research study investigated an innovation designed to build student teacher self-efficacy. The expectation was it would increase the likelihood that new graduates would stay in the profession. The innovation taught student teachers to conduct action research within communities of practice. The Concerns-Based Adoption Model was used to monitor their progress. It involved two phases. The first phase measured student teacher self-efficacy prior to and following the innovation, and the second phase measured self-efficacy of former graduates, novice teachers, who had graduated from the preparation same program. Both populations were interviewed to elaborate on the self-efficacy data. Results suggested that student teachers who conducted action research within communities of practice showed a significant increase in self-efficacy. Specifically, the structure of action research guiding their collaborative efforts at problem-solving played a substantial role in increasing their confidence to face their future classroom challenges. The study also found that novice teachers who had performed the same action research within communities of practice retained a higher level of self-efficacy in their first five years of practice. [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://bibliotheek.ehb.be:2222/en-US/products/dissertations/individuals.shtml.]