A radical transformation in workplace education practices may imply a shift in the culture of learning. This is the challenge that a French public training organization undertook to tackle from its headquarters on a national level. The shift in practice that the organization has been experimenting relies on the use of Study Circles as a model of Adult Cooperative Learning, sometimes referred to as Learning Circles. Deployment of the model for workplace learning and professional training banks on the potential that this format holds to introduce changes in public services by enhancing the agency of public service actors, enabling them to modify structurally stratified perceptions and practices. After setting up a series of eight Learning Circles, the organization set out to study their effects using a compatible participatory approach. Action Research was chosen. This paper reports on the outcomes of the study the Action Research team undertook during a year-long cycle that ended in January 2023.