AbstractHistory of Science Today. The paper argues for a theoretically demanding history of science along three lines. (1) History of science requires a permanent reflection on the concept of history. (2) It demands an epistemological reflection on the historically changing forms of knowledge. (3) An intimate knowledge of scientific practice is necessary, be it more theoretically or more practically oriented. These competences can be brought together in a multitude of ways, but they need to complement each other.