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This research is focused on inter-organizational coordinating activities and cooperative practices performed during an experimental category management approach. Coordination within and across these supply chains is a developmental process always in the making. It unfolds to make ambiguous and uncertain managerial situations more intelligible and to trial novel possibilities for joint action. Cooperation is resistible and voluntarist: it is neither clan- nor contract-based but relies on an organic solidarity to manage the inevitable pluralism of views and conflicts in a creative and dialogical way.