Selecting the sharpest tools to explore the food-feed-fuel debate: Sustainability assessment of family farmers producing food, feed and fuel in Brazil

► Framework supporting transparent tools and methods selection. ► Explore sustainability of family farmers cultivating castor beans for biodiesel in Brazil. ► Opportunities to introduce castor beans are farm specific. ► Compromise between animal and castor bean production dependent on current productivity. ► How castor beans are included determine trade-offs between sustainability criteria.