These include those working on development and climate issues, as well as the private sector. Each of these communities has their own views on important issues for climate finance, some of which have been laid out as principles relating to climate finance effectiveness. These views and principles are often at the institutional, national or international level. Indeed, the extent of common ground has been growing over time, as the climate community has integrated principles agreed in the development community (e.g. via the Paris Declaration and Busan Partnership) and vice versa (e.g. on the importance of transparency). For example, all three communities agree that scaled-up climate finance is needed, that both public and private sources can play a key role, and that the (self-) sustainability of a project and transparency is important.