Graph I above compares the percent of students in San Ysidro who scored proficient or advanced on the California State CST for Algebra 1.   2007 represents students who did not receive instruction based on Algebraic Thinking in grades 5- 7.  2008 represents students who were enrolled in AT for at least two years prior to taking Algebra 1 in grade 8.  This growth in percent passing of 23% is compared to the growth state wide of 4%.   
Graph II above compares the same data from a percent of change model.  The percent of change for San Ysidro students was 49%while the percent of change state wide was 11%.