Haja-Becker, Shajahan2018-11-072018-11-072018http://hdl.handle.net/2003/3738810.17877/DE290R-19383enGesellschaft für Didaktik der Mathematik510Investigating student teachers` use of Cinderella 2.8 in primary classroom through Artefact-Centric-Activity Theory (ACAT) frameworkconference contribution