TY - CONF A1 - Voigt, Christian A1 - Swatman, Paula T1 - Online Case Discussions: Tensions in Activity Systems T2 - Sixth IEEE International Conference on Advanced Learning Technologies (ICALT'06), 05-07 July 2006, Kerkrade, The Netherlands Y1 - 2006 UR - https://opus4.kobv.de/opus4-hs-duesseldorf/frontdoor/index/index/docId/3605 SN - 0-7695-2632-2 SP - 748 EP - 750 PB - IEEE ER -