A public good system managed by GIIN. The system helps investors measure, manage, and optimize their impact. It provides core metrics sets aligned to the SDGs and organized by the Five Dimensions of Impact, the IRIS catalogue of standard metrics, evidence maps connecting common strategic goals to outcomes, and how-to guidance and resources.

1. IRIS+ System. (n.d.-b). IRIS+. Retrieved October 5, 2022, from https://iris.thegiin.org/
2. United Nations Development Programme. (2021). SDG Impact Standards Glossary. https://sdgimpact.undp.org/assets/SDG-Impact-Standards-Glossary.pdf