This text has for origin the observation of a dialogue organized by the conurbation of Niort around its future cultural skill. It turns to the contradictions, tensions and repositionings revealed on this occasion by the actors in presence. This exercise updated quite at the same time practices of collective action around the culture, the results out of step with the social investment which they suppose as well as supports and moving problems at stakes. The change affecting the collective conducts, already underlined by the author in 2003, hardened and diversified. The indecision of collective action, the resources for the organized action, is a problem for sociocultural community developpers and educators. The analysis consists in seeing how cultural actors are also absorbed, in different ways, by this indecision.