In this study, the authors investigate the impact of authoring hypermedia on English as a second language sixth- and seventh-grade students' academic English vocabulary and underlying-concept development. Analysis of data showed that students participating in hypermedia projects, as opposed to traditional science or social science curriculum, were better able to acquire content-specific concept terms. Interview data revealed that students found projects worthwhile because they allowed students to personalize their learning and accomplishments. (Contains 2 tables.)