The article discusses how to assess the sustainability of circular inter-firm networks, which are important for a circular economy. The researchers reviewed over 100 publications and found that life cycle-based methods and indicator frameworks are commonly used for assessing sustainability. They also found that industrial ecology focuses more on environmental assessments, while circular supply chain management includes social aspects. Overall, the social dimension is often overlooked in sustainability assessments for these networks. The researchers developed an integrated framework to help decision-makers choose the right assessment methods for circular inter-firm networks.