There is an urgent need to better understand the role that the use of blended finance in development co-operation can play in achieving the Sustainable Development Goals (SDGs). By adopting the "Blended Finance Principles for Unlocking Commercial Finance for the SDGs" in 2017, members of the OECD's Development Assistance Committee committed to "monitor blended finance for transparency and results". The practical implications of monitoring and evaluating blended finance are currently being explored with a view to providing further policy guidance on the implementation of these Principles. This paper contributes to the ongoing consultation process by discussing governance and methodological challenges in blended finance evaluation and proposing a few options to deal with them.

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