Some Plans in Arts and Science require the student to take supporting courses. These are courses in a subject different from that of the Plan but are required prerequisites for upper year courses. An example would be a first year calculus course in a Physics Plan.
When combining Plans in Medial or Major-Minor degrees, courses common to the two Plans cannot be shared between the requirements of the two Plans. In such cases, an alternative must be chosen. Supporting courses are the exception to this rule: a supporting course in one Plan can be used towards the requirements of the other, increasing the number of electives available to the student. See the Degree Programs section of the Arts and Science calendar for complete details of how courses are shared between Plans.