In this article, the learning progress of one fifth-grade student is examined with regard to the development of her graph interpretation skills as she participated in the Junior Science Institute (JSI), a two-week, science intensive summer camp in which participants engaged in microbiology research and application. By showcasing the student's development of graph interpretation skills, the authors hope to make apparent some of the cognitive processes students may go through as they attempt to master this important inquiry skill and thus provide fellow teachers with insight as to how to more effectively develop these skills in their own students. (Contains 4 figures.)