An internal classification system is instruments used to assign inmates to housing or program after they are placed in a particular prison. This does not apply to all inmates because some have medical conditions and sometimes there is not enough availability in that housing location. Herbert Quay came up with the internal classification system used in most prisons in the Adult Internal Management System (AIMS).
This system analysis life history records and a correctional adjustment checklist of each person who enters the jail system. It identifies everything from an inmate that might be violent and aggressive to jobs they previously were assigned