Clean Shipping Index (CSI) delivers market incentives for clean shipping. CSI is an independent labelling system of the environmental performance of ships and shipping companies. It is a tool to achieve environmental progress in the shipping industry. The basis of the Clean Shipping Index is a questionnaire covering the environmental performance of ships. The questions cover general information about the shipping company as well as vessel-specific information. A key point is that this process goes beyond existing regulations and covers vessels of all types.