Annual prison performance ratings
Prison level performance is monitored and measured using the Prison Performance Tool (PPT). In 2021/22 this provided a data-informed assessment of performance in each prison to derive overall prison performance ratings. As part of the end of year moderation process, each prison's data-informed provisional rating was scrutinised by HMPPS officials against wider evidence, including data on how COVID-19 had impacted each site, to agree final ratings.
In the PPT, overall performance is rated as either performance is acceptable or performance is of concern.
The data source for this measure and more detailed information can be found in the prison performance ratings (annual) publication.