The EU Reference Document on Addressing Undernutrition in External Assistance seeks to help transform aid programmes so that they can achieve real progress in preventing undernutrition. It provides a detailed description of how nutrition benefits can be realised by modifying the design of programmes in all relevant sectors and thematic areas — from health to governance, food security to gender. Nutrition-specific objectives need to be incorporated in the design of assistance programmes – whatever the sector or aid modality – thereby seeking and measuring specific results on nutrition. Tackling undernutrition thus becomes the responsibility of all, not just left to technical experts.