Intermediary organizations can amplify the efforts of on-the-ground social innovators to tackle complex issues in a variety of ways: e.g., help coordinate their efforts, create or enhance different capabilities (e.g., evaluation, social finance, leadership ), develop, test and – if possible – scale promising solutions, as well as “do whatever it takes” to achieve greater impact. This paper explores how to understand and track their contributions to social innovation processes and what that might mean for funders who support their work.