Children who are victims of adverse childhood experiences may display behaviors in school that hinder their ability to develop socially and academically. The purpose of this research study was to determine the potential effectiveness of the Compassionate School training model. This study was a program evaluation that examined staff training focused on childhood trauma and its effects on staff members' perceptions, behaviors, actions and attitudes toward traumatized children in two urban school districts. Phase I included four urban schools that participated in 2008 in the pilot program and Phase II included 10 additional schools in 2009-2010 that participated in the training. The ex-post facto research design utilized a mixed methods approach. The data collected was pre-and post-surveys and climate surveys. Analyses involved descriptive and inferential statistics and content analysis (coding). Phase I results indicated that there was significant difference in the pre-attitude scores and post-attitude scores. The results suggest that the training on trauma does have an effect on teachers' attitudes. The content analysis results on the narrative responses indicated that there was a significant change in teacher's actions and behaviors toward traumatized children. The key areas such as gaining more knowledge and interest were not significant, which may be due to some extraneous variables. In addition to the pre-and post-surveys, Phase II used a district staff climate survey to measure results in five areas: feeling of safety, effective communication, student learning, high expectations and support for diversity. Three of the five areas, effective communication, student learning, expectations and support for diversity were significant. [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.]