The study presented in this paper deals with the use of 3D boundary objects in stakeholder management. The main research objective is to understand the contribution that 3D boundary objects can make to a project in terms of knowledge and stakeholder engagement. The methodology used here is of a participatory and collaborative nature, and this choice is tied to the praxeological and theoretical context of the study. The results of the study show that 3D boundary objects facilitate the engagement of stakeholders and create knowledge in certain conditions, in particular related to the management style of the project manager, his or her experience and expertise. The praxeological and theoretical implications encompass both learning for a practitioner and the pertinence of enriching certain project management conceptualizations.