the middle of the cycle could be shared between the two institutions. In the 2008 exercise, this was abolished.

The assessment of 2008 also brought in a major change. Instead of a single grade for an entire subject area ("unit of assessment"), a grade was assigned to each research output. This was done to counter the criticism that large departments were able to hide a "very long tail" of lesser work and still get high ratings and, conversely, excellent staff in low-graded departments were unable to receive adequate funding. Thus the