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Wang, P.Y. & Lu, Y.H. (2011). The effect of program complexity on low-achieving students’ learning: 4th grade multiplication as an example. In C. Ho & M. Lin (Eds.), Proceedings of E-Learn 2011--World Conference on E-Learning in Corporate, Government, Healthcare, and Higher Education (pp. 2103-2110). Honolulu, Hawaii, USA: Association for the Advancement of Computing in Education (AACE).