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Testimony of CALDER Director Jane Hannaway before the D.C. City Council on the human capital initiatives of the District of Columbia's Public Schools, given January 16, 2009. Hannaway describes CALDER's work on teacher quality addressing three main findings: (1) Teachers are the most important school factor that affects student learning, and the variation in effectiveness across teachers is large; (2) The variation in teacher effectiveness is greater within schools than the variation between schools; and (3) The variation in teacher effectiveness, both within and between schools, is a management problem that begs for attention. Hannaway argues at least some of this variation is a civil rights problem that demands policy attention and urges DCPS to continue to pursue new human capital management strategies to ensure teacher quality for all students.