 Enrollment decreased by 1 percent, a slower decline than prior years.However, significant achievement gaps remained between students in high-performing and low-performing school districts, and between white and black students.Education historian Diane Ravitch questioned the legitimacy of Rhee's results, alleging that "cheating, teaching to bad tests, institutionalized fraud, dumbing down of tests, and a narrowed curriculum" were the true outcomes of Rhee's tenure in D.C. schools.