Developed under FAO’s RENOFARM (Reduce the Need for Antimicrobials on Farms for Sustainable Agrifood Systems Transformation) initiative, this practical manual serves as a complementary resource for livestock Farmer Field School (FFS) facilitators. It introduces established social and behavioural science methods and frameworks, offering an innovative lens to address the persistent challenge of turning knowledge into consistent on-farm action. The manual outlines a structured four-step process for seamlessly integrating social and behavioural science approaches into existing livestock FFS programmes. FFS facilitators will be guided in identifying which recommended practices are difficult for farmers to adopt, diagnose structural, capacity-related, socioeconomic, cultural, and motivational barriers, and ultimately support sustainable behaviour change through collaborative solution designing. These methods are illustrated with real-world examples from extensive on-site validation.By introducing social and behavioural science frameworks into the FFS approach, this manual addresses a central challenge in agricultural development: good practices only make an impact if they are adopted. By supporting the uptake of healthier and more sustainable livestock practices, it contributes to reducing the need to use antimicrobials, ultimately strengthening rural livelihoods and the resilience of agrifood systems.