By their nature, the majority of DFIs use concessional instruments, such as blended finance. This work stream will focus on concessionality where it is present. To what extent this is the case, how these decisions are made, and how this affects the resulting deal are rarely disclosed. At the same time, achieving the sustainable development goals (SDGs) will rely on the ability to leverage increased private financing alongside ODA. As such, increasing focus has been given to using blended finance to mobilise private funds in developing economies. This work stream will centre on the transparency of these processes with particular focus on the size and rationale of concessional lending provided to the private sector and the levels of mobilisation that DFI investment creates.