The AGROMIX project aims to deliver participatory research to drive the transition to a resilient and efficient land use in Europe. It focuses on practical agroecological solutions for farm and land management and related value chains. AGROMIX makes use of a network of 83 sites with Mixed Farming (MF), AgroForestry (AF) or value chain stakeholder networks, which are used to measure, design, model, test and improve these systems. A nested approach will be used to conduct 12 co-design pilots across Europe. In addition, 6 replicated long-term trial sites are used for detailed analysis (crops and livestock). AGROMIX has six specific objectives: 1) Unlock the full potential of synergies in MF/AF systems. 2) Develop and promote value chains and infrastructure for MF/AF produce. 3) Develop the MIX-A toolkit to co-design and manage MF/AF systems in practice. 4) Identify and model transition scenarios. 5) Develop policy recommendations and action plans for a successful transition. 6) Maximise the impact and legacy of the project for building low-carbon climate-resilient farming systems. AGROMIX uses a transdisciplinary multi-actor research approach with 10 universities, 7 research institutes and 11 multi-actor partners. It will use Reflexive Interactive Design methodology to include stakeholders in participatory co-design and implementation of MF/AF systems. The research starts with a work package (WP1) on context, co-creating a resilience framework. WP2 on systems design and synergies is at the heart of project. WP3 on indicators and scenarios will refine the greenhouse gas inventories for MF/AF systems and model transition scenarios. WP4 develops and tests the MIX-application/serious game. Further WPs are on economics and value chains, and on policy co-development, action plans and dissemination delivering impact and exploitation through practical innovations on farms, in value chains, at different policy levels and through communication and knowledge hubs across Europe.