In this keynote, I will start from the so-called method « social LCA », because it is the only one domain where I have few knowledge. Nevertheless, some ideas might be deemed interesting for colleagues working in sustainable LCA or LCC. About the implementation domains, it is the same. I mainly will talk about agro-food value-chains (filiera). Some parts of the energy sector (that I barely do not know) might be concerned too. So, let’s start with the roles allocated by different actors to the social LCA tools, sometimes to become aware of social effects… and sometimes with other purposes.