Together, this totalled nearly USD 29 billion on average per year in 2011-12. The more recently established and OECD-hosted Research Collaborative for Tracking Private Climate Finance has also been instrumental in co-ordinating emerging findings on methodologies to estimate mobilised private climate finance, collaborating across the DAC, MDBs, DFIs, countries and expert organisations. Building on the work of the Research Collaborative, most recently a group of 19 bilateral climate finance provider countries developed a common understanding of the scope of mobilised climate finance and a common methodology for tracking and reporting towards the USD 100 billion a year goal (TWG, 2015), This report also benefits from the collaboration with Climate Policy Initiative, which brings its own knowledge on the overall landscape of global climate finance flows. Furthermore ongoing developments in, and discussions about, climate finance definitions and measurement approaches mean that this report can only present preliminary estimates of progress towards the USD 100 billion a year goal.