As part of its effective teaching initiative, the Bill & Melinda Gates Foundation partnered with three urban school districts across the U.S. and a group of four charter management organizations to undertake a strategic set of human capital reforms. A key objective of the "Intensive Partnerships for Effective Teaching" program was to promote increased access among disadvantaged students to the most effective teachers in their respective sites. The IP initiative includes an integrated set of programs or levers designed to improve teacher human capital in each site and to improve the access of the most disadvantaged students to the best teachers working within a site. These levers include efforts to improve how teachers are recruited, hired, and professionally developed; how they are evaluated, rewarded, and dismissed; and how they are assigned to--or incentivized to work with--high-need students. This paper discusses trends over time in the correlation between a teacher's value-added estimate and the proportion of students in her caseload and school who are both low-income and minority (LIM). This report is the third in a series that RAND has published that documents teachers' value-added estimates in mathematics and reading by the proportion of their students who are LIM. The paper also includes an appendix containing additional tables.