The ability to work effectively with diverse student populations is increasingly important for student affairs practitioners as college campuses become more diverse in their student populations. A three part conceptual framework for developing multicultural competence was used to design a master's level course on multiculturalism and diversity. This framework includes developing awareness, knowledge, and skills in order to become competent in working with diverse populations. An action research design within a case study method was used to improve teaching and learning in this masters level course. Findings indicate growth in the instructor's own classroom practice and growth in students own awareness of their assumptions and worldviews, development of a knowledge base about diverse populations, and minimal growth in skill attainment for working with diverse student populations. Findings also suggest that action research is a very effective means for reflecting upon, and improving, teaching practice as well as reflecting upon students' own learning.