Naturfag.no and Viten.no are two electronic resources for science education aimed at teachers and students respectively. On a yearly basis Viten.no is used by over half of all students in the first year of secondary level education.

This presentation will show how the two web sites are integrated in a single Topic Map with the official teaching curricula from GREP, and how the learning resources are shared with the rest of the world using derived metadata in NORLOM (the Norwegian version of the Learning Object Metadata standard) and the protocol OAI-PMH. We will also discuss some of the challenges involved in integratring with external sources, such as GREP, and handling large quantities of data in a topic map.