The document summarizes an evaluation study of the Open Government Data (OGD) implementation efforts of the City of Vienna. The study included interviews with municipal departments, citizens, businesses, researchers and journalists in 2012. In 2013, a workshop was held with heads of municipal departments to discuss increasing data supply and novel publication methods. Key findings included that departments saw value in OGD but faced resource constraints, while stakeholders wanted improved data access and harmonization. Recommendations focused on integrating OGD into broader open government strategies, improving data infrastructure and public relations, and addressing incentives and skills.