GCSE row: Ofqual says teachers 'not to blame'
2 November 2012 Last updated at 09:54 GMT
Too much pressure on schools in England to get good GCSE grades led to over-generous marking of course work by teachers, the exams watchdog Ofqual concludes.
In its final report on the controversy over this summer's GCSE English exam, Ofqual says external examiners had to raise grade boundaries as a result.
Ofqual chief executive Glenys Stacey told BBC News it was "not the teachers' fault", blaming a "weakly designed qualification" and "great pressure".
She added it was "impossible to identify teacher-by-teacher what is happening", but said that the overall GCSE system would be looked at to make it "more robust".