First step questions were about the demographic and social background and basic identification of the witness. Questions asked about the name, gender, date of birth, date of arrival in South Korea, place of birth and residence in North Korea, level of education in North Korea, employment and type of work in North Korea, marital status in North Korea, family in North Korea, date of the last defection from North Korea, present state of physical and emotional health, present address, present family and present employment. Second step questions were about how the witness was experienced in PPC (about detention and work in the PPC). Questions were asked about the details of judiciary process and charges such as preliminary interrogations, trial and the procedures of detention, name of PPC, period of detention, whether or not family was informed, type of work in the PPC and process of separation (defection). Third step questions were about general information such as the location of PPC. Questions were asked about the details of the location/official title, information about when the PPC was set up and history of expansion/closure of the PPC, management and system of security (including number of guards), facilities for administration and work, size of the PPC and deployment and organization of work units, number of prisoners and characters (charges against them), possibility of release and process of release and, etc. The fourth step questions were about the present operation system. Questions were asked about the details of operational and management system of the PPC, control and management of prisoners (systems of control and surveillance of prisoners and etc.), rules and regulations for management and prisoners, facilities related to punishment of prisoners, and size and 24