Co-institutional schools employ a style of schooling wherein both male and female students study on the same campus but classes are single-gender. Usually each division has its own building but may, on few occasions, use the facilities of the other division. Each division has its own administration and maintains its own courses, dress code, schedule, and other aspects. The two divisions may often share the same name.
This system is founded on the belief that students learn better in a single-gender environment. A co-institutional school differs from a single-sex school because it offers closer interaction between the two genders. Activities such as track and field, theater, cross country, model UN, ultimate, mock trial, speech and debate, and multi-cultural clubs are more successful under this system than they might otherwise be at a single-sex school.
One of the most prominent schools of this kind is Regis Jesuit High School outside of Denver, Colorado, the only Jesuit school in the United States that follows this model.