This study, Evaluation of an Intensive Truancy Reduction Program (ACT) within Communities In Schools, is a within-school, student-level randomized controlled trial evaluation of an intensive truancy reduction program (ACT) through Communities In Schools (CIS), within five schools in a large urban district in the Southwest. CIS has adapted the CIS Core model for case management (Core) with an adaption of a community-based psychiatric rehabilitation treatment model and named the new model ACT. The three-year longitudinal study, conducted during the 2016/17 - 2018/19 school years, included 2,136 6-8th grade students (1,152 ACT students and 984 Core students). Data was collected including student demographic information, implementation fidelity information, as well as baseline and outcome data related to student attendance, behavior, standardized test scores and on-track to graduate status (when applicable). Fidelity information includes the number of received CIS services by service type and overall total number of services as well as total hours of CIS services provided by student.