The web became a medium favoured to accompany the process of sociocultural patrimony building. It intervenes for example more and more often to realize the preservation, exploitation and valuation of the heritage with interactive platforms using documentary corpuses and digital archives. The design choices of platforms modify the processes of patrimony building. We make the hypothesis that by favouring the transverse access to the digital resources and the dialogues between the people having various interpretations of these sites, it is not only possible to modify the dynamics of the patrimony design of a place but also the professional practices of the researchers studying this place. We explored this hypothesis in the context of the patrimony design of the prison « Montluc » in Lyon. We studied, with a group of future users, various principles of information access and contribution so as to identify those who are preferred to favour the appropriation of the information and the emergence of new memories. Our study showed that it was necessary to rethink the design of the Web platforms by crossing the principles of Web-documentaries, data base platforms and contributory personal spaces. To develop the practices of contribution, we suggested working on the design of situations of collaborative contributions in the domains of the scientific research and the learning.