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Elliott, D., Holschuh, D. & Kim, B. (2002). 4-D Modeling Tools and Mental Models: What Can We Learn From Usability Testing?. In P. Barker & S. Rebelsky (Eds.), Proceedings of ED-MEDIA 2002--World Conference on Educational Multimedia, Hypermedia & Telecommunications (pp. 978-983). Denver, Colorado, USA: Association for the Advancement of Computing in Education (AACE).