These principles from the National Council of Nonprofits are “designed for use by nonprofits, governments, foundations, and for-profit entities when considering launching pay-for-success initiatives, social impact bonds, or other new funding mechanisms. … [These principles aim to] help parties contemplating alternative funding arrangements set expectations and avoid unintended consequences as they seek to address community problems. The Principles can aid in decisions about how to structure future partnerships — or to determine whether these funding mechanisms may not be right for a particular project or community.”