This chapter introduces 12 categories of societal challenges that NBS can address (Section 4.1). These are conceptually mapped against the UN Sustainable Development Goals. For each of the 12 societal challenge areas, Section 4.2 outlines and lists indicators to evaluate the performance and impact of NBS. It reviews the different types of NBS, gives examples of each NBS type, and lists the indicators related to the particular societal challenge in a series of tables. Associated methodologies are compiled in the related Appendix of Methods. To help navigate, the indicators are classified as structural, process-based or outcome-oriented. Structural indicators are particularly useful during the NBS planning process and can help identi...