This Guide on Blue Economy for the Regional Seas Programme is intended to be a steppingstone for the Regional Seas – with their diverse legal, institutional, and implementing set-up, their wide range of capacity and available resources, their unequal levels of influence and scope, the individual Conventions and Action Plans are at various stages of developing and getting involved on the path towards Ocean sustainability and improved Ocean Governance. They have to make strategic choices that are not uniformly applicable in all regions around the globe, but they also have a common strength: the mandate to leverage regional cooperation among nations that are facing shared challenges and need common solutions.