Open data is becoming more and more available, but is mostly designed as a one-way street. Data will flow from the governments to the data users, but the information flow from users to the government is either overlooked or ill-constructed. In the case of the Dutch geographical key registries (BGT/BRT/BAG) the ambition is to get both data flows right, by embracing concepts as volunteered geographic information (VGI) and user-centred scrum development. This talk will show the 'improve the map'-application which is developed by the Dutch Cadastre, including its concepts and theories behind it, its current looks and experiences and its bright future. The application is created entirely from opensource components. Moreover, more Dutch open geodatasets are currently interested in using the application which will bring data providers and data users closer together. Our ambition is that every open dataset deserves its easy-to-use feedback application which is open to everyone. And with everyone we really mean everyone: even primary school kids will help us to keep our maps of good quality.