In the United States high school students may take college level courses that count for credit in both high school and college, often called dual enrollment. Students may take courses at their high school from certified instructors or at a local college. We investigate possible differences between these two groups of students using student level data from Colorado. To improve the quality of the comparisons we use propensity score matching to produce like groups and compare grades and credit hours earned at three time points. We utilize this case study to assist readers in considering about when to use propensity score matching, approaches to matching including types of matches, tests for quality of matches, and robustness of results. Specifically, we provide a case study using nearest neighbor matching on a large dataset. [This content is provided in the format of an e-book.]