This study integrated multiple survey instruments to test the effectiveness of the mitigating factors of supervisory working alliance, history of previous trauma, levels of resilience, personal counseling, and mindfulness against Secondary Traumatic Stress. The sample size consisted of 50 counselors-in-training enrolled in masters counselor training programs. The findings showed that there was not a significant relationship between secondary trauma and the mitigating factors of supervisory working alliance, history of previous trauma, levels of resilience, and personal counseling. A significant inverse relationship between secondary trauma and mindfulness practice was found. The implications drawn from this study are primarily linked to counselor educators and supervisors regarding what studies can be helpful in understanding the mitigating factors for secondary trauma in counselors-in-training. [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.bibliotheek.ehb.be/en-US/products/dissertations/individuals.shtml.]