National needs information about prisoners and those under probation supervision is available to those making decisions about HMPPS service planning and provision. Immediate needs of prisoners are recorded on the Basic Custody Screening Tool (BCST). The needs of those under supervision by probation are recorded on case management systems. Assessments of both those in prison and on probation are completed using the Offender Assessment System (OASys) and other specialist tools. This information is used to plan delivery of interventions that help reduce the likelihood of reoffending and/or manage the risk of serious harm. Additionally, national data tools, including segmentation of the prison and probation population, are made available to HMPPS periodically to support business planning decisions at a local and national level.