To provide highly specialist psychological assessment and treatment for service users experiencing moderate, severe and complex mental health/psychological problems based upon the appropriate use, interpretation and integration of complex data from a variety of sources including psychological and neuropsychological tests, self-report measures, rating scales, direct and indirect observation and semi-structured interviews with service users, their family and/or carers. To contribute directly and indirectly to a psychologically based framework of understanding and care to the benefit of all service users, the settings in which they present, and agencies involved in the psychological, emotional and behavioral well-being.