This collection of essays first highlights the popularity of interdisciplinary undergraduate studies and their recent gains in the world of higher education, and then addresses the paradoxical failure of these studies to achieve a permanent position in the curricula of individual universities and colleges. This question and its attendant issues are explored in three ways: (1) an overview of how these changes are affected by the political economy, (2) case studies from actual universities and colleges, and (3) a discussion of the sustainability of undergraduate interdisciplinary studies programs.