“…127-128) underlines that "construction of a spreadsheet requires learners to identify variables and information needs, develop formulas and functions, complete the spreadsheet, and use the spreadsheet to answer questions," and calls for the evaluation of "accuracy of variables," which stands for "all important variables identified" and "variables have a proper range of values." Apart from spreadsheets, this perspective can be applied to other computer software such as multimedia/hypermedia and expert systems (Jonassen, 2000a(Jonassen, , 2006, resulting in positive learning effects (e.g., Chu, Hwang, & Tsai, 2010;Kadijevich & Haapasalo, 2004;Lamontagne, Desjardins, & Bénard, 2007;Lee, Chu, & Ip, 2005). However, Jonassen's books do not address challenges met by those who develop and use spreadsheets and other digital models.…”