“…In 2003, Jan Meyer and Ray Land published a report titled "Threshold Concepts and Troublesome Knowledge: Linkages to Ways of Thinking and Practicing within the Disciplines." The report was followed by several journal articles, conference proceedings, and edited monographs Land, Cousin, Meyer, & Davies, 2005;Cousin, 2006;Meyer & Land, 2006;Rowbottom, 2007;Land, Meyer, & Smith, 2008;Sabri et al, 2008;Srivastava, 2013;Launius & Hassel, 2015;Land, Meyer, & Flanagan, 2016). In this literature, a threshold concept or TC is described as "a portal, opening up a new and previously inaccessible way of thinking about something" (Meyer & Land, 2003, 1).…”