The interactive documentary field has a collaborative dimension since its beginning. This research proposes a model for the analysis of the participation of online communities within interactive documentary, developed on the basis of the previous scientific literature on this topic. Then, analysed case studies have shown the diversity of forms regarding contribution from online communities. On the basis of the different trends observed, five participative designs with different intensities and purposes have been described. Finally, the model has been applied to each design for its evaluation, allowing us to conclude that a significant participation would have to combine several of these designs considering the articulation of participant communities around documentary as well as its contribution to documentary meaning.