The goal of this study was to determine whether a passive or an interactive tutorial design improves understanding of key concepts, as measured by pre- and post-test data. The authors also collected data regarding the participants' preference for taking an interactive versus a passive tutorial. The interactive tutorial group improved statistically significantly from pre-test to post-test for all three learning questions. While the passive tutorial group improved from pre-test to post-test on all three questions, the improvement was statistically significant for just two of the three questions. The majority of the participants preferred interactive tutorials (78%) to passive tutorials (22%).