This week, experts from the International Institution for Applied Systems Analysis (IIASA) are invited to discuss the topic of governance in NBS. Key aspects of governance such as stakeholder collaboration and financing are explained. Especially with the matter of financing, an important question that is discussed in this episode is whether NBS are more cost-effective than traditional gray solutions. At the end, experts pass on some significant lessons to the listeners that they have learned based on their experience in NBS governance.