Investigation and classification is one of the important measures of modern execution. In order to understand the personality, physical and mental conditions, abilities, social background, education level, family environment, occupation, religious beliefs, recreational hobbies, criminal history and reasons of each inmate, the Prison carries out investigations and tests and collects extensive information on the inmates and draws up a treatment plan. The Prison conducts various investigations and psychological tests when each inmate is admitted to the Prison. In addition, in the visit center, the Prison gives newly admitted inmates a lecture to tell them the rules to be observed and their rights.  Based on the information obtained from the preliminary investigation, the Prison draws up individual treatment plans.