Restricted to students in the School of Architecture. Advanced problems in architectural design. For 561R, ten studio hours a week for one semester; for 661R, fifteen studio hours a week for one semester. May be repeated for credit when the topics vary. Offered on the letter-grade basis only. Prerequisite: Architecture 521E (or 520E) with a grade of at least C; Architecture 521G (or 520G) with a grade of at least C; and satisfactory completion of third-year portfolio review.