Value creation from open data growth faces several challenges, e.g; they risk to be too supply-driven, or that they lack of incentives for the re-use. This paper reports an ongoing research/programme on the stimulation role in an open data ecosystem to mitigate these concerns. First, we present the empirical roots of this role that can be drawn from several initiatives undertaken in different countries and trying to bypass the obstacles faced by potential open data re-users. We discuss the importance of a legal framework inductive to foster innovation and transnationality of the re-use. Then, we introduce the BE-GOOD programme which aims to develop new methods to build an open data ecosystem. Slim Turki, Sébastien Martin, Samuel Renault {slim.turki, sebastien.martin, samuel.renault}@list.lu Luxembourg Institute of Science and Technology (LIST.lu) http://dl.acm.org/citation.cfm?id=3129787 http://www.researchgate.net/publication/317278867_How_open_data_ecosystems_are_stimulated