opportunities allowing them to experience the country more comprehensively, such as freedom of movement within the city without being accompanied by minders, and the chance to live alongside local students. Unlike foreign tourists, international students are permitted to take the subway and taxis without guides or interpreters and are able to use the internet, providing they have access to foreign web sites. International students at Kim Il-Sung University live alongside specially trained and vetted local students called tongsuksaeng, who are ostensibly there to act as hosts and to teach the Korean language and culture, but in reality served to spy on the international students, through going through their belongings and tracking their movements. Foreign students seeking to undertake postgraduate studies at Kim Il-Sung University are required to provide their birth certificate, a letter of intent, their undergraduate certificate(s), a police certificate stating that the applicant does not have a criminal record in their home country, medical records certifying the applicant had a recent health examination, details of their financial background to show how they will be financing their education in North Korea, as well as a letter vouching for the applicant's Korean language ability. Adult education Because of the emphasis on the continued education of all members of society, adult or work-study education is actively supported. Practically everyone in the country participates in some educational activity, usually in the form of "small study groups." In the early 1990s, people in rural areas were organized into "five-family teams." These teams have educational and surveillance functions; the teams are the responsibility of a schoolteacher or other intellectual, each one being in charge of several such teams. Office and factory workers have two-hour "study sessions" after work each day on both political and technical subjects. Adult education institutions in the early 1990s included "factory colleges", which teach workers new skills and techniques without forcing them to quit their jobs. Students work part-time, study in the evening, or take short intensive courses, leaving their workplaces for only a month or so. There are also "farm colleges", where rural workers can study to become engineers and assistant engineers, and a system of correspondence courses. For workers and peasants who are unable to receive regular school education, there are "laborers' schools" and "laborers' senior middle schools," although in the early 1990s these had become less important with the introduction of compulsory eleven-year education. See also Pyongyang