“…As a teaching method, the theory is used to design activities for the teaching of a mathematical concept and to examine the mental structures of students after the implementation of these activities (Trigueros & Martinez-Planell, 2010). As seen in the related literature, although the APOS Theory is mostly used for data analysis (Bansilal, 2011;Brijlall & Maharaj, 2015;Brijlall & Ndlazi, 2019;Chimhande, Naidoo, & Stols, 2017;Martinez-Planell, Gaisman, & McGee, 2017) and as a teaching method (Martin, Loch, Cooley, Dexter, & Vidakovic, 2010;Possani, Trigueros, Preciado, & Lozano, 2010), it is also possible to find studies in which the APOS Theory was used for both purposes (Figueroa, Possani, & Trigueros, 2018;Maharaj, 2013;Moon, 2019;Ndlovu & Brijlall, 2019;Trigueros & Possani, 2013). In summary, the APOS Theory can be used for data analysis, as a teaching method, or both.…”