Schools Chancellor Kaya Henderson continues to use her predecessor's IMPACT teacher-evaluation program, which D.C. Council Chairman Kwame R. Brown says would not be affected by his proposals to give top teachers incentives to work at low-ranked schools. (Barbara L. Salisbury/The Washington Times)

Schools Chancellor Kaya Henderson continues to use her predecessor's IMPACT teacher-evaluation program, which D.C. Council Chairman Kwame R. Brown says would not be affected by his proposals to give top teachers incentives to work at low-ranked schools. (Barbara L. Salisbury/The Washington Times)