Over the past decade, schools have increasingly adopted trauma-informed practices (TIP) due to research confirming the negative impact of adverse childhood experiences (ACEs) and trauma on children and youth. This study explored how trauma-informed training affects teachers' experiences of meaningful work. The study is based on the theoretical frameworks of Deci and Ryan's self-determination theory (SDT) and Bandura's self-efficacy theory, as well as Rosso et al.'s (2010) research on meaningful work. The research used a quasi-experimental, nonequivalent group posttest-only design to measure the impact of trauma-informed training on teachers' sense of meaningful work. Additionally, this study examined the relationship between teachers' self-efficacy and work motivation for meaningful work. The study used three instruments to survey teachers: the Teacher's Sense of Self-Efficacy Scale (TSES), the Work Tasks and Motivation Scale for Teachers (WTMST), and the Work and Meaning Inventory (WAMI). [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.]