TAP™: The System for Teacher and Student Advancement was launched in 1999 as a comprehensive educator effectiveness model to offer career advancement and leadership opportunities for educators, a fair and transparent evaluation process linked to job-embedded professional development and performance-based compensation, which culminate in improved instructional practices and student achievement. This study illustrates the impact of the TAP System in 66 Louisiana schools. These are primarily high-need schools, with average free/reduced price lunch eligibility of 86%, impacting more than 32,000 students each year. The authors report evidence of a positive effect of the TAP System on student achievement using two complementary analysis strategies: (1) They found a significant positive effect of TAP on 2012-13 K-8 Assessment Index scores, controlling for previous achievement, percentage of students receiving free or reduced price lunch, school configuration, school size (number of students), and percentage of English language learners. The 66 TAP schools scored 3.7 points higher on average than non-TAP schools statewide; and (2) They also found that the TAP schools had significantly greater 2012-13 Assessment Index scores than a group of matched control schools. The TAP schools scored 5.5 points higher on average than their matched controls.