CHORIZO Changing practices and Habits through Open, Responsible, and social Innovation towards ZerO food waste Across Europe, people are becoming increasingly more aware of the impacts of food loss and waste (FWL). But what role do social norms and values play in supporting or hindering us from reducing food waste and loss? The CHORIZO project, which stands for “Changing Practices and Habits Through Open, Responsible, andSocial Innovation Towards Zero Food Waste”, explored this topic and worked with relevant actors to find answers to this question. The project aimed to improve the understanding of how social norms influence behaviour and food waste and loss generation as well as use this knowledge to improve the effectiveness of decision-making and engagement of food chain actors toward zero food waste. Through the lens of six relevant case studies, including schools, food banks, and hotels, the consortium of 14 organisations from across Europe worked together to research previous actions to reduce food loss and waste; generated new evidence on the interaction between social norms, behaviour, and food waste; fed this information into scenario-based models and a new database; and created communication and science education packages to support a range of actors to take action and innovate to reduce food loss and waste. Building upon the research, modelling and data generated in the CHORIZO project and based on behavioural models, the CSCP created actor-specific guidance in order to help different stakeholders change social norms. This publication brings together all the social norms knowledge and insights from the CHORIZO project in a series of guidance documents, targeted to specific actors. It also introduces an 8-step approach of running social norms-informed behaviour change interventions: defining your objective understanding your target group determining relevant social norms—are they descriptive (what people do) or injunctive (what people feel they should do)?, choosing the right approach-do you want to strengthen, change, or create a norm?, planing the intervention, carrying out a reality check, implementing the intervention, evaluating impact. Furthermore, the CHORIZO Visualiser helps explore how messages might play out across contexts, and the CHORIZO DataHub gathers documents and datasets on FLW with an AI-supported search to quickly find relevant evidence. In order to support action across Europe, the CSCP further developed and ran a tailored capacity building programme, adapted from our Academy of Change. Designed as a key mechanism for CHORIZO to translate its research and tools into actionable knowledge for food system actors, the capacity building programme targeted a broad range of stakeholders, including policymakers, civil society organisations, local authorities, school and food service actors, food banks and researchers. The 8-step approach—central to all training activities—provided a clear, structured framework that participants could follow to create their own social norm-informed interventions. To support this, the programme offered a combination of online and face-to-face formats, including two in-person workshops and five online sessions. Through this combination of research, modelling, adaptation of findings to specific groups, and tailored capacity building, the Chorizo project aimed to shine new light on the role of social norms in the FLW field, leading to impactful reductions in a range of real-life contexts in Europe. The CHORIZO consortium consisted of a multidisciplinary group composed of 14 participants from 9 different countries within the EU. This project was funded by the EU Horizon 2020 research and innovation programme.