Philosophy for Democracy is a research project that aims to examine whether and how Philosophy with Children contributes to the development of democratic skills and attitudes. In the Netherlands, as in almost all Western countries, Philosophy with Children is linked with the movement for citizenship education. This article reports the research on the practice of Philosophy with Children. Sixteen philosophical inquiries by children in the classroom were recorded, transcribed and analysed. The analyses show that children develop relevant reasoning skills and advanced dialogical skills. The study shows that embedding Philosophy with Children in a democratic practice is necessary for contributing to a critical-democratic citizenship development. The study also shows that Dutch children often give their opinion, but are not often involved in inquiring their own opinions. From a pedagogical point of view, we think that in Dutch culture and in Dutch schools it would be important to stress more a dialogical--community-based--inquiring attitude.