District officials revealed Thursday that they commissioned an investigation last summer into possible cheating at 26 public and public charter schools where reading and math proficiency on 2008 standardized tests increased markedly.
The probe, an analysis of incorrect student answers that were erased and changed to correct answers, found "anomalies" at some of the schools that administered the D.C. Comprehensive Assessment System (DC-CAS) test. But officials called the investigation, conducted by the test's publisher, CTB McGraw-Hill, "ultimately inconclusive."
District officials did not name the schools that were investigated, and they did not release a copy of the CTB McGraw-Hill report, which was requested by The Washington Post on May 29 under the Freedom of Information Act. Officials also offered no explanation for the interval between the conclusion of the investigation in March and their decision to disclose it at a news conference called by Mayor Adrian M. Fenty (D) on Thursday.
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