In early 2013, more than 60 leaders of mature collective impact initiatives gathered in Cincinnati for a three day workshop to discuss their work leading backbone organizations, and to learn from each other about how to improve their practice. The workshop was organized by the Aspen Forum for Community Solutions, FSG, the StriveNetwork, and the Tamarack Institute. At the close of the three day workshop, leaders from FSG, Strive, and Tamarack participated in a discussion on critical questions raised by workshop participants. The conversation touched on a range of topics including articulating the value of the backbone organization to funders and community partners, measuring the success of the backbone organization, and building shared leadership for collective impact work. This report reflects that panel discussion.