PACE Center for Girls is a Florida-based organization that provides academic and social services to girls of middle school and high school age. Girls who attend PACE have a specific set of characteristics that put them at risk of involvement with the juvenile justice system and other negative outcomes. PACE seeks to reduce the likelihood of negative outcomes tied to this profile and instead foster academic engagement, positive youth development, and healthy relationships. Throughout its delivery of services, PACE uses principles of gender-responsive programming -- that is, treatment approaches designed for girls and women. The current report focuses mainly on the impact and cost analyses for the PACE evaluation. Using survey and administrative data, the research team measured differences between the program and control groups on short-term outcomes. Differences that emerge between the two groups on these outcomes can be attributed to the PACE program. The impact study, which employed a random assignment design with two research groups, found that PACE positively affected girls' academic engagement and progress. In other domains -- youth development, risky behavior, and delinquency -- girls in both the program and control groups had similar outcomes. The cost analysis found that the additional cost of attending PACE, compared with the academic and social services the control group received, is principally driven by the extensive social services PACE provides. [For earlier MDRC publications on the PACE Center for Girls evaluation, see ED564138 and ED574048.]