H.U. HoppeUniversity of Duisburg, COLLIDE Research Group, Dept. of Math./Computer Science,
- Deductive error diagnosis and inductive error generalization for intelligent tutoring systems in IJAIED 5 (1)
- A Framework System for Intelligent Support in Open Distributed Learning Environments in IJAIED 9 (2): "Special Issue on Computer Supported Collaborative Learning "
- Cognitive apprenticeship - the emperor's new method?: a polemical reaction to the debate on situated cognition and cognitive aopprenticeship in IJAIED 4 (1)