CSSBoost also introduces the methodological concept of the CSSBoost Integrated Solution that involves the integration of one or more CSS within a digital environment, enhanced by tailored methodology and procedures. This physical system is virtualised, monitored, analysed and assessed by developing the key CSSBoost innovation, the Virtual Regional CE/CSS Ecosystem and Market (VCEM). CSSBoost designs a set of diverse Exemplary CSSs, both as transition tools and to validate and promote its ideas by applying and demonstrating them in five city, regional and interregional Pilot Cases. The exemplary CSSs respond to different challenges, barriers, needs and feasibilities across EU and target different product value chains, as delineated in the EU’s Circular Economy Action Plan (Water, Food, and Nutrients; Plastics; Batteries & Vehicles).