Context: The 2008 Research Assessment Exercise returned 26% of the 1225 staff submitted as being world-leading (4*) and a further 47% as being internationally excellent (3*). The 2008 Research Assessment Exercise also showed five subjects – Pure Mathematics, Epidemiology and Public Health, Chemical Engineering, Civil Engineering, and Mechanical, Aeronautical and Manufacturing Engineering – were assessed to be the best[clarification needed] in terms of the proportion of internationally recognised research quality.

Question: What percentage of Imperial's staff was classified as world leading in 2008?
Answer: 26%

Question: What percentage of Imperial's staff was deemed to be internationally excellent in 2008?
Answer: 47%

Question: Which group assessed Imperial's staff members to determine their standing in relation to the rest of the world?
Answer: Research Assessment Exercise

Question: How many subjects were judged to be the best in terms of internationally recognised research quality?
Answer: five

Question: what assesment showed 1225 staff to be world-leading?
Answer: Unanswerable

Question: What showed 26% of staff to be internationally excellent?
Answer: Unanswerable

Question: What five subjects where shown to the top ranked in the world?
Answer: Unanswerable