“…Less than a half of articles have evaluated the validity of the developed models. Some models (e.g., Jaffry & Capon, 2005;Reeves & Reid, 1999;Sing, Love, & Tam, 2014;Williford & Chang, 1999) were just tested based on feedback from professionals and qualitative data collected from senior managers. In other cases, the results of models were compared to other techniques; for example, Mantel and Gaalman (1982), Özdemir-Akyıldırım and Talay-Değirmenci (2015), and some other authors have trusted their models based on agreement between their results and data extracted from other relevant publications (e.g., Denton, Gafni, & Spencer, 1994;Haase, Lewis, & Kao, 1996;Ho, 2010;Sing et al, 2012b;Stone & Fiorito, 1986).…”