We propose a four-voice reflection on forms of collective intelligence based on the work carried out within the IDEKI network and various research projects. This work links research to the dimensions of real professional activity by crossing the orientations in didactics and the fields of professionalization, construction of professionalism, accompaniment and professional development. We will focus on two different professional communities and the analysis of their practices and the impact on the professional development of the actors. First, school nurses who work with digital professional tools, secondly, librarian-teachers who develop digital writing practices in blogs.