This report presents a synthesis of two studies conducted in this series: "Achieving Circularity for Single-Use Plastics" and "Achieving Circularity for Durable Plastics." The former study focuses on the use of plastics in packaging and single-use household goods with lifetimes of less than a year. On the other hand, the latter study explores durable plastics in sectors such as Construction, Textiles, Electronics & Electricals, Automotive, and Fishing & Aquaculture. Together, these studies provide comprehensive coverage of approximately 80% of Norwegian plastic consumption, offering a holistic view of the national plastic system. The objectives of this Synthesis Report and the two studies in the "Achieving Circularity" series are threefold: i. To produce a data-driven scenario analysis for the entire Norwegian plastic system to inform strategies and resource allocation for all stakeholders in the value chain. ii. To provide evidence-based recommendations on priority areas needed to transform the Norwegian plastic system. To strengthen partnerships and collaboration between stakeholders across the value chain, in both the public sector and civil society, by providing a quantitative reference point to facilitate evidence-based conversations in order to explore dierent strategies for achieving a better plastic system in Norway.