Transitioning from the current linear economic development model to a circular economy (CE) is a hot topic in academic literature, public governance, and the corporate domain. Actors have implemented CE strategies to reduce their resource use and its associated impacts, while boosting economic competitiveness and generating positive social impact. Companies are identified as key actors in transitioning to a CE, and many academics have proposed tools to assess CE and guide them in this process. This paper critically reviews such academic ‘assessment approaches’ at the micro level in order to reflect on their key properties. Seventy-four approaches are inventoried through a systematic literature review of academic literature. A critical review framework is constructed and applied, containing four perspectives: A general perspective, a descriptive perspective (methodological aspects), a normative perspective (connections to Sustainable Development), and a prescriptive perspective (implementation-focused). Methodologically, the 74 approaches are highly diverse, having various connections to previously established methodologies. Eighteen of the reviewed assessment approaches include all three dimensions of Sustainable Development (SD), in addition to a ‘circular’ dimension. Roughly one quarter of the approaches apply a participatory design approach. Suggested key desired properties of CE assessment approaches include making use of existing assessment methodologies such as Life Cycle Assessment (LCA), and a closer collaboration between science and practitioners to consider end-user needs in the design of CE assessment approaches.

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The circular economy (CE) concept has become a major interest for companies, promising new business opportunities and a decrease in environmental impacts. Though research on circular business models has recently increased, few scholars have investigated how companies engaged with CE view the connection between CE and sustainability. To address this gap, this paper uses a semi-quantitative survey and semi-structured interviews conducted with companies based in Italy and the Netherlands. Purposive sampling was employed to target firms associated with national and international CE networks, as these companies already engage with CE practices. The survey was distributed online to over 800 firms, of which 155 provided information on their understanding of the CE concept and its relationship with sustainability. The survey results are complemented through findings from 43 interviews with a subset of the survey respondents. The survey answers show that companies view CE as one of the tools to achieve sustainable development, particularly in the environmental domain, where the focus lies on environmentally friendly resource use. Yet, the respondents are less confident whether CE increases economic and social benefits of firms. Interviews show that a majority of respondents position sustainability as the overarching concept. However, most companies advocate that the private sector should strive for both sustainability and circularity, though the distinction between the two concepts in daily business operations seems synthetic and futile to some. These findings provide an important stepping stone for better understanding how firms could apply CE practices to move towards a more sustainable society.

An emerging research area is dedicated to developing approaches for assessing the 'circularity' of companies and their products, within the context of sustainability goals. However, empirical evidence on the uptake of these assessment approaches remains scarce. Using a purposive sampling, we conducted a survey receiving 155 responses and held 43 semi-structured interviews with Dutch and Italian companies active in circular economy (CE), pursuing three research aims: to explore the use of CE and sustainability assessment approaches; to study the process of developing assessment approaches; and to uncover benefits of-and barriers to-CE assessment.While we find high variability of assessment approaches, most often, companies develop tailor-made sustainability indicators and apply life cycle assessments to CE strategies. Importantly, assessment development for CE practices requires and facilitates collaboration with external stakeholders. Finally, we reflect on the paradox of standardisation versus tailoring of assessment approaches within the CE reality and recommend establishing company needs and capabilities before designing assessment approaches.

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