This study explored a way of assessing the impact of business education on students' ethical orientations, by comparing MBA students' entry-exit responses to two different instruments. Results showed significant reductions in the propensity for unethical decision scores, but not in the propensity for moral disengagement score. This study had also a practical purpose: to illustrate a way business schools could evaluate their efforts at ethical education and present their achievements in compliance with accreditation requirements (particularly, assurance of learning procedures). By highlighting the study's limitations (particularly, measurement and research design), the authors propose a research program for business schools.