Blue Valley, the fourth largest school district in Kansas, covers 91 square miles. More than 20,000 K-12 students attend its 34 schools ( five high schools, nine middle schools, and 20 elementary schools). Of the district's students, 8% qualify for free and reduced lunch and about 3% are English Language Learners. Blue Valley began using Measures of Academic Progress® (MAP®) in 2005 in order to track students' academic growth over time and independent of grade level. Having experienced how MAP data helps inform student learning and professional development in older grades, in 2010 the district also decided to implement computer-adaptive MAP for Primary Grades (MPG) in all 20 elementary schools, starting in kindergarten. Like their MAP-using counterparts, district teachers have discovered a core benefit of MPG data: it lets them identify each student's learning levels and skill gaps in order to quickly and precisely differentiate instruction-whether students are below, at, or above grade level. Blue Valley educators have found that MPG helps them set students on the right track early on, ensuring they enter the older grades with unparalleled growth and ready to take on the challenges of the Common Core Standards.