It shall define the set of KPIs (Key Performance Indicators) selected, that will be used to assess the methodology defined in Work Package 1 (WP1): renaturing city methodology and also in each demonstration city diagnosis and baselines being developed (WP2, Valladolid; WP3, Liverpool; WP4, Izmir), where the projected NBS (Nature Based Solutions) are related to both a challenge and to KPIs. In this document the methodology for the monitoring of different NBS and a global perspective, shall be approached by outlining the main challenges and focused on goals that have been drawn directly from the Eklipse Mechanism; a self-sustained mechanism under the umbrella of the European Union’s Horizon 2020.