Mastery Manager is the flagship assessment solution of Goldstar Learning, Inc., a Chicago-based software development company established in 2003 to answer education’s evolving assessment, reporting and data-analysis needs. Mastery Manager is utilized in K-12 schools across the country, in both large and small districts, and in public, private and charter schools. Mastery Manager was conceived, designed and developed from the ground up by the dedicated programming staff at Goldstar Learning, in collaboration with educators from many schools, including high performing Blue Ribbon schools such as Adlai Stevenson High School in Lincolnshire, Illinois. From the very beginning, working with Rick Dufour’s PLC assessment team, the Mastery Manager system has been focused on providing teachers and administrators with real-time, actionable, standards-based achievement data to inform instruction. The immediacy and depth of the assessment reports provide educators with timely information they need to identify those students who may be at risk and provide the detailed proficiency information to help raise their level of student learning.