Supporting Effective Teaching in Tennessee: Executive Summary | Page 41

Figure 4.3

Achievement Gains by District, 2007-08

Notes: The data for the lower graph is calculated by measuring how a district’s eighth grade students performed on the TCAP
relative to students in the rest of the state in 2008 (as a percentile) and subtracting from it how a district’s third grade students
performed on the TCAP relative to students in the rest of the state in 2003 (as a percentile). Separate change scores were calculated
for both reading and math and then averaged together to create a single change score.
Source: Tennessee Department of Education

The five high-performing districts examined are extremely
diverse. Not only is there one district from each ach