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Charter schools had to replace an average of more than half of their
teachers between 2008 and 2010, a turnover rate on par with some of the
most troubled district-run schools. Experts say that high teacher turnover is associated with a school in
turmoil and that instability often hampers student performance.
Mayor Richard M. Daley has vowed to continue with his Renaissance 2010 strategy. Yet six years after it was launched, nearly 3 out of 4 Chicago schoolchildren still attend low-performing schools. Top officials acknowledge that new schools are not the main spark for systemwide improvement.