This report by ADEME assesses methodologies for measuring packaging reuse rates in France, targeting compliance with national reuse goals under AGEC and Climate Resilience Acts. It involved interviews with stakeholders to establish data requirements, identify reusable packaging types, and develop calculation methods for producers responsible for packaging or importing. The report covers reuse arrangements, from pre-packaged products to refills, and includes recommendations for systematic data collection and monitoring. An accompanying document provides guidelines for implementing reuse data collection processes.