The AACSB requires continuous improvement of business school outcomes through a comprehensive Assurance of Learning program. Measuring ethical decision making poses an interesting challenge for schools making it central to their mission. The authors provide an innovative and effective approach to assessing ethical decision making and closing the loop for continual improvement. Using a web-based simulation, results from 2 cohorts suggest that improvements based on shortcomings of one cohort can impact decision-making behaviors of subsequent cohorts. (Contains 1 figure and 2 tables.)