The Questions and Unanswers About Social Innovation seminar series brings together scholars from around the world to debate important issues about social innovation. This special issue codifies and extends several debates from the inaugural series. Consistent with the seminar format, each paper in this special issue addresses a question of importance to social innovation, presents opposing answers, then identifies contingencies that cause variation in the focal relationship, and closes with insights on how to integrate these seemingly divergent perspectives in order to move the field forward by asking better research questions.