OCS programs offer you the opportunity to enhance your major, concentration, or other areas of academic interest while broadening your liberal arts education by learning about another part of the world. On some programs, the courses are linked by a common theme, such as women's studies, environmental studies or global development studies. On others, coursework may be closely connected to a particular major such as biology or economics. Some programs, however, are not particularly specialized and offer a range of courses in the liberal arts. OCS programs may be organized by U.S.-based educational institutions, universities in the host country, or a combination of both in a cooperative arrangement. Formats vary from traditional classroom-based instruction to field work, independent research, and internship opportunities.