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HM inspectors have made judgments about the overall effectiveness of schools only since January 2000. Prior to September 2005 schools were inspected on a six-year cycle and since September 2005 schools have been inspected on a three-year cycle. The framework used to categorise schools changed in September 2005, and judgments across the new framework are not comparable to judgments across the old framework. Most schools have not yet been judged on the new framework.