During performance year 1 April 2011 to 31 March 2012 there were 4 levels of performance marking within BIS:
- HSP - highly successful performer
- SP - successful performer
- PSP - partially successful performer
- UP - under performer
The data provided reflects the distribution of these performance markings across all staff (including the guided distribution for that year) and then broken down by the following groups: location; grade; working pattern; age; ethnicity declaration; disability declaration and gender.