The document summarizes findings from a review of marine spatial plans around the world. It finds that most plans are implemented at smaller spatial scales than entire ecosystems. It also finds that few institutional changes are made to governing bodies to implement coastal and marine spatial planning, relying instead on existing agencies. Additionally, it notes that while formal decision support tools are used, informal expert judgment also plays a role. The main messages are that there is no single approach for marine spatial planning and that the value is in the planning process of engaging stakeholders as much as the final plan.