The article aims to investigate how key e-Governance dimensions related to openness, such as transparency and accountability, which are a necessary condition for reaching a high maturity of e-Government, may not be sufficient for open government. For this purpose, an interpretative framework to identify country attitudes towards Open Government is proposed and it is applied to two cases drawn from different legal, cultural and organisational backgrounds. Among the key findings of the article, the 'attitudes mapping' resulting from the application of the interpretative framework to the case studies points out the key role of different governance traditions in the path towards open government.