Open Data has to be seen in the context of empowering citizens to do informed decisions. Without information, citizen can not decide in an informed way who to vote for, so democracy can not work without open information. But open data is not a cause in itself. It also means that people must be able to understand the data easily, be able to access it without problems and can work with it. Only then people will realise the importance of open data and only then will „opening up“ data be sustainable. Open Data, Usability and Sustainability therefore can not be separated.