This special section contains selected papers presented at Modularity 2015, the fourth annual conference on modularity. I had the honor to chair the conference's "research results" Program Committee and thus to edit this special issue. The papers in this special issue were selected based on input from the conference Program Committee. Authors of these selected papers were invited to submit a revised and extended version of their work. Each revised paper was refereed by three experts, including members of the original Program Committee when possible. As is usual, papers were revised if necessary.
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