The Denver Preschool Program (DPP) makes quality preschool possible for all Denver families, regardless of income or neighborhood, through a dedicated sales tax first approved by voters in 2006 and renewed in 2014. As of the 2014-2015 school year, DPP has provided more than $67 million in tuition support, which has helped over 36,000 4-year-olds attend a quality-rated preschool of their family's choice. Furthermore, DPP has invested more than $10 million in quality improvement of its 250 plus preschool partners; a growing list that includes community-based centers, home-based centers and Denver Public Schools (DPS) preschool classrooms. DPP completes an annual longitudinal analysis to determine if children who participated in the program were more likely to succeed in kindergarten and early elementary school. Conducted by Augenblick, Palaich and Associates (APA) the analysis compares how former DPP students performed on Colorado's third grade standardized achievement tests to those who did not have DPP experience. It also takes into account the following demographic variables: race, Free and Reduced-Price lunch (FRPL) eligibility and English Language Learner (ELL) status. (author abstract)