This study focuses on the implementation of an early warning indicator and intervention system in 20 southern high schools. This model included a team of teachers, counselors, and student support services personnel who analyzed ninth grade student-level data and implemented and monitored interventions. The team was led by a half-time coach who established protocols for team operations and provided updated early warning indicator data. Findings indicated variability in the frequency and scale of the interventions initiated and monitored by the promotion coaches and early warning indicator teams. This study further demonstrates that higher levels of implementation of early warning and intervention components in the treatment schools were associated with improved levels of ninth grade student attendance and course performance even after controlling for prior attendance. [This paper was published in "Preventing School Failure" v63 n1 p77-88 2019 (EJ1209816). Note: The publication year of the article (2018) shown on the PDF is incorrect. The article was published in 2019.]