For individuals with special interests, modified or self-designed majors in which chemistry is combined with such disciplines as biology, earth science, mathematics, physics, or environmental study can be arranged. At Dartmouth, the course requirements for a modified major are proposed by the student and, subject to broad institutional guidelines, approved by the several departments or programs of relevance. In addition to modified majors in chemistry and a second science, recent examples of creative curriculum planning have included modified majors in Chemistry and Psychology, Chemistry and Religion, and Chemistry, Government and Economics. Dartmouth's guiding principle is that a modified or self-designed major, however diverse, must simply constitute a unified and coherent whole.