Significant infrastructure investments are needed for the world to achieve the Sustainable Development Goals (SDGs) and Paris Agreement targets. However, there is a significant gap between investment requirements and actual current global investments. To close this gap, both public and private sources of finance are required. Additionally, more climate finance should be channeled from the national and international levels to the local and regional levels where project implementation takes place. In reality, there are a number of factors standing in the way of linking infrastructure projects to financing. This is why project preparation is key to making projects investment ready. This report analyses project preparation tools, approaches, main bottlenecks and solutions, by presenting three case studies as well as highlights from expert interviews.