To better understand causes of attrition from a limited residency doctoral program, this paper describes the results of a seven-year study wherein the author collected data reflecting a given student's preference for information perception and focus. These constructs, based on Jung's theory of psychological type, have been hypothesized to be directly related to academic achievement. While no statistically significant results were realized, the effect sizes clearly show that students with a preference for information perception via sensing (e.g., a preference for systematic goal-oriented work that is organized, steady and linear) are more likely to succeed in programs such as the one described in the paper. (Contains 5 tables.)