In the most recent national research assessment (2001), LSE came second after Cambridge in the UK for the quality of its research. LSE submitted 97 per cent of its staff for assessment, more than any other university. A further review in 2003, retrospectively introduced a higher grading of 5** for subject areas which had achieved 5* in the two previous rounds of the research assessment exercise. Economics and Social Policy all received a 5**. In total, LSE received 12 grades of 5**,5* and 5 for all but one of its units of assessment.