Tools for Life®: Relationship-Building Solutions (TFL) is a program designed to improve school climate and safety through the proactive development of elementary and middle school students' interpersonal skills (relationship-building and communication) and intrapersonal skills (self-regulation and resiliency). In the 2016–2017 and 2017–2018 school years, the Jackson (Mississippi) Public School District (JPSD) implemented TFL in grades 1 through 8. RAND researchers conducted a randomized controlled trial to determine whether TFL, integrated into existing school practices, positively affected school climate and safety in the district. In this report, they describe the implementation of TFL in JPSD, calculate its costs, and evaluate the program's effectiveness.