Navigating Impact Investing

Led by the consulting firm Tideline, together with Cathy Clark at CASE i3 at Duke University, the Navigating Impact Investing project began in September 2015 as an effort to bring greater clarity to the field of impact investing, supported by Omidyar Network. The project also included a dedicated Advisory Group, members of which are listed in the working paper Appendix, and featured a capstone convening on February 10, 2016, at BlackRock in New York.

Impact classes are a new concept and will only be useful if they are adopted widely with a set of common definitions. So, in addition to releasing the working paper Navigating Impact Investing: The opportunity in impact classes, we have created this site to encourage a broader, field-wide conversation about the prospective nature and uses of impact classes.

Each page of this site allows for comments on a section of the working paper. We look forward to your feedback, provocative questions, and support to determine the most useful classifications to drive successful investment with financial and social returns.

For a brief introduction to the idea of impact classes, please also see our SSIR Blog: Cracking the Code of Impact Investing.

The full working paper on this site is also available as a PDF download:

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We welcome your feedback and comments. If you prefer to send in comments by email, please send them to


The Project Team

Ben Thornley, Tideline, co-lead
Cathy Clark, CASE at Duke University, co-lead
Christina Leijonhufvud, Tideline
Aaron Arnoldy, Tideline
Bryan Locascio, Tideline


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