 Inter-qualifying groups and setting up a collective power to act 
The emergence of critical and multi-dimensional situations in urban areas calls for new professional alliances and/or individual citizens who can provide answers commensurate to their complexity. Setting up inter-qualifying groups is likely to help meet such a challenge. What is their methodology ? What role does the supporting third party play ? How do they, by means of their specific knowledge production system, contribute to increasing each player’s power to act and to establishing a collective power to act ? What is their contribution to public policy ? The author answers these questions based on the experience, in France, of those who have been organized around preventing youth involvement in drug trafficking.