REF 2021 comprised three elements:
- academic outputs, comprising a portfolio based on the FTE of REF-eligible staff submitted;
- research impact, submitted as a number of impact case studies (ICSs) in proportion to the total FTE of REF-eligible staff submitted;
- research environment, comprising the total number of research degrees awarded between 2014 nd 2020, total research income received over the same time period, and an environment statement detailing how the submitting unit(s) supported research and impact over the period.
Outputs,impact and environment were weighted 60:25:15 respectively. All three elements were graded on a scale from 0 (unclassified) to 4* (world leading) and the results were published as quality profiles showing the percentage of outputs, impact and environment considered to meet each of the starred levels. Submissions were invited to 34 Units of Assessment (UoAs); LSE made 15 submissions to 13 UoAs across the SHAPE subjects.
For REF2021, HEIs were required to submit research outputs by all eligible members of staff. Each submitted member of staff could submit between one and five outputs, with the total number of outputs per UoA calculated as total FTE of staff multiplied by 2.5.
Staff were eligible for REF2021 where they were on a teaching-and-research or research-only contract of at least 0.2 FTE on 31 July 2020 and had a substantive connection to the submitting HEI. Research-only staff also had to be classified as independent researchers. HEIs were also required to identify which eligible staff had significant responsibility for research. LSE submitted 100% of its staff meeting these definitions, but other HEIs had eligible staff who did not have significant responsibility for research and hence had a submission rate of less than 100%.
See here for a full glossary of REF terminology.