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Regions around the world employ cluster-based policies as part of their industrial, innovation and development policy mixes. They have become a key tool in smart specialisation strategies and are increasingly used to address societal challenges. Given their popularity and longevity, there is significant demand to better measure and understand the impacts of cluster policies. Yet the diversity of cluster policies employed in different regional competitiveness policy mixes, a complex effect logic and a variety of (mostly intangible) outcomes, and few recognised norms for guiding cluster policy evaluation all hamper a more holistic understanding of their patterns of effects and broader impacts. There lacks a common frame to guide cluster policy evaluation. This paper reviews international evidence on the effects of cluster policy programmes from academic and policy literature, which is then used as an input into a co …