Ph.D. students may include graduate courses outside the Department of Chemistry on their Program of Study to allow for exposure to a broader base of advanced or interdisciplinary subject matter. Courses offered by departments other than Chemistry may be listed on the student's Program of Study, as long as they are approved by the student's research advisor and Advisory Committee. For the Ph.D. degree, a maximum of two of the six required graduate courses may be taken outside the Department of Chemistry. Any graduate course taken outside the Department of Chemistry and listed on the student's Program of Study must be passed with a grade of B or better. The six graduate courses required for the Ph.D. degree should normally be completed by the end of the fourth semester in residence.