Research Assessment Exercise 2008
4*
Quality that is world-leading in terms of originality, significance and rigour.
3*
Quality that is internationally excellent in terms of originality, significance and rigour but which nonetheless falls short of the highest standards of excellence.
2*
Quality that is recognised internationally in terms of originality, significance and rigour.
1*
Quality that is recognised nationally in terms of originality, significance and rigour.
u/c
Quality that falls below the standard of nationally recognised work.