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Interdisciplinary research (“IDR”) is often trumpeted as essential for scientific and technological advancement. However, interdisciplinarity is an ambiguous and multidimensional concept: there are several legitimate perspectives on how to track it --and a lack of consensus on which are the most appropriate.

This website offers a novel tool, the overlay maps of science, as a method to explore the degree of interdisciplinarity of a set of publications. The overlay technique visualizes the spread of publications over the global map of science, i.e. the structure of science as obtained from the analysis of cross-citations between disciplines.