The Urban Institute designed this toolkit for individuals, governments, and organizations currently working on a pay for success (PFS) project or considering initiating a PFS project. This assessment tool describes the core elements of PFS projects and explains the importance of each core element. It also provides stakeholders with a scoring system to help distinguish the strengths and weaknesses of a proposed project and generates recommendations for remedying any weaknesses. Stakeholders can use this tool at any stage of project development. Completing this assessment also helps build the business case for a proposed project that scores well in each area.