Procedural security measures involve a procedure, process or a set out routine that must be followed, which is in place to organise how prisons operate and manage the inmates, among other things. Procedural can also involve the detection of possible issues and problems, and then isolating and dealing with them. This type of security can also include much of the stuff that goes on internally, like information detection and collation. This is used at search points located around the prison complex, and also forming profiles and keeping records. This type of system is very important because it keeps everything in a structured order and includes information on all inmates and how things should run, particularly the security side of things. Procedure security contributes to the sorting of offenders to the right type of prison, which can depend on a number of different things. Dangerous and high level risk offenders can therefore be place in maximum security, category A prisons as opposed to category D Open prisons.