The evidence base for this Project has included an analysis of 2,934 Nature-based Solution (NbS) projects, extensive literature reviews, and through using expert input and review. In addition to identifying examples of NbS implementation in countries eligible for Overseas Development Assistance (ODA), the case study analysis was used to inform other work across the Project, to support and verify findings from the literature. For further information on this data collection and analysis, please see the Methods Document. In addition, 460 indicators were reviewed to provide context for biodiversity indicators measuring the impact of NbS interventionsand to develop biodiversity indicator guidance. Interim reportsare available which summarise this evidence base. 104 Evidence Base Evidence Base