Prince George's County Public Schools began working with National Training Network to implement the Algebraic Thinking curriculum in grade 6 in the summer of 2005, grade 7 in the summer of 2006, and grade 8 in the summer of 2007. Teachers were trained prior to the start of each school year and follow up trainings were offered each subsequent summer through 2009 for new teachers to Algebraic Thinking. National Training Network provided onsite coaches in each of the elementary and middle schools in Prince George's County on an average of two days per month per school. Students were placed in Algebraic Thinking based on the previous year's MSA scores. Each school determined the cut off score for placement in Algebraic Thinking for students who scored proficient, however all students who scored basic were recommended to be placed in Algebraic Thinking. The graph above illustrates the percent of change for students in grades 6, 7, and 8 in Prince George's County between 2005 and 2009.