Since German universities do not offer accommodation or meals, students are expected to organize and pay for board and lodging themselves. Inexpensive places in dormitories are available from "Studentenwerk", a statutory non-profit organization for student affairs. However, there are only enough places for a fraction of students. "Studentenwerk" also runs canteens and cafés on campus, which are similarly affordable. Other common housing options include renting a private room or apartment as well as living together with one or more roommates to form a "Wohngemeinschaft" (often abbreviated WG). Furthermore, many university students continue to live with their parents. One third to one half of the students works to make a little extra money, often resulting in a longer stay at university.