Circularity Indicators: the Advisor.

Summary Over 50 sets of circularity indicators – created and used by academia, consulting companies and governmental agencies worldwide – have been reviewed and classified into a need-based taxonomy driven by the usage of such indicators. A query tool associated to the proposed taxonomy databank – using MS Excel with macros – has been designed to help identifying the most relevant indicators regarding the user needs. In inputs, eight questions are asked about the: i) scale of measurement. ii) circularity perspective. iii) circularity performance. iv) circularity loop. v) dimensionality. vi) usages and purposes. vii) transversality. viii) type and format. In outputs, appropriate indicators are identified and following information is displayed: a) tool/indicator name. b) working principle. c) systemic level. d) kind of circularity. e) dimensionality and unit. f) data required to compute the indicator.