This Practice Note has been archived and is no longer maintained. This Practice Note deals with the law on prisoner categorisation. It covers categorisation of adult males serving determinate sentences, the over-arching principles of categorisation, the legal framework of categorisation, the process of categorisation for Category A prisoners, the process of categorisation for prisoners other than Category A or life sentence prisoners, the first formal review of Category A prisoners, subsequent reviews of Category A prisoners and reviews of non-Category A prisoners.