The prison and probation services operate within the framework of the National Offender Management Service (NOMS) Agency. For historical reasons the two services have different employment structures. Prison service staff are civil servants and are directly employed by the NOMS Agency. Probation service staff are not civil servants and are employed by a probation board or trust. It is recognised that there is a difference in the operational need of both services. This is reflected in their terms and conditions and different operational structures. Terms and conditions are kept under review in developing pay modernisation strategies for both services.