Interorganizational collaborations are increasingly used to tackle some of society’s most complex challenges. In health care, this takes many forms, such as strategic alliances, interorganizational networks, joint ventures, and public-private partnerships. The effectiveness of these collaborations hinges on participants pooling expertise toward the joint goal, but also on whether participants leverage each other’s expertise for their own organizations’ independent goals. The spillover of progress on those independent goals can sustain participation in the collaboration itself.