Considering planetary boundaries and properly integrating them into Life Cycle Assessment (LCA) models is a crucial challenge for absolute environmental sustainability assessment. However, this poses new challenges for LCA practitioners, both methodologically (e.g., scaling down planetary boundaries, impact allocation) and practically (e.g., data access).

In parallel with these methodological and practical challenges, this session aims to initiate a discussion on the possibility of such an assessment during the design and development phases, not only for new products (e.g., advanced materials, innovative processes and/or technologies) but also for territorial systems (e.g., circular value chains at the regional or national level).

At the same time, this session invites all contributions – whether methodological and/or practical, academic and/or industrial – discussing the challenges and/or solutions for a sound – i.e., scientifically-based and pragmatic – quantification of circular economy practices' performance:

1. From system boundary definition to impact allocation, including life cycle inventory data for circular economy;

2. The compatibility between LCA and circularity indicators and their usefulness for guiding sustainable circular decision-making;

3. From methodological proposals to tool development;

4. - Feedback on the joint application of ISO 14040/44:2006 and ISO 59020:2024 standards.