In today's society the principle of the circular economy is becoming crucial, as it strives to reduce the use of limited material and energy resources. Adequate evaluation is key to progress monitoring, but it is currently not unified, as there are several systems framing circular economy and providing different methodologies for its evaluation. In this master’s thesis, we investigated different systems and methodologies and we also identified tools that can be used to evaluate circularity at different levels. First, we focused on the identification and structuring of the indicators required by the various systems. Then, based on the criteria, we selected eight different tools that evaluated the transition to a circular economy in different ways and carried out comparative analysis. On this basis, a relationship between them was established and a "map of indicators" was created. Next, we focused on the selected tool and performed sensitivity analysis using hypothetical input data. The results show that the circular economy is monitored on three levels. First, on a semi-global level, where the European system represents the official framework, while the OECD and Ellen McArthur systems only provide recommendations. At the medium level, EU member states rely on the European system, while for the micro level, there is a wide range of commercial tools that evaluate the circularity. Based on a detailed analysis of the selected tool, we conclude that the evaluation methodology is not necessarily transferable between individual levels, and that the pursuit of a high degree of circularity at the micro level does not also guarantee a high degree of circularity within a formalized framework in the European Union
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