One of the great challenges in agricultural research is to design approaches that are effective in creating knowledge that is usable by farmers, either in the developed world or in the emerging economies. Approaches that have been designed to enhance this effectiveness include participatory approaches, co-creation of knowledge, action research, and trans-disciplinary approaches. They have in common that they involve scientists from very different disciplines. CSA wants to play its part in developing and applying these approaches and therefore seeks synergy with the social sciences. Within the theme there is some focus on genotype x physical environment x society interactions and seed systems.