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Ifenthaler, D., & Seel, N. M. (2005). The measurement of change: Learning-dependent progression of mental models. Technology, Instruction, Cognition and Learning, 2(4), 317–336. 

Dummer, P., & Ifenthaler, D. (2005). Planning and assessing navigation in model-centered learning environments. Why learners often do not follow the path laid out for them. In G. Chiazzese, M. Allegra, A. Chifari, & S. Ottaviano (Eds.), Methods and technologies for learning (pp. 327–334). Southampton, UK: WIT Press.