“…Two DT approaches emerged from this educational research tradition. The first is Gal'perin's (1957/1989b, 1978/1992) method of stage-by-stage formation of mental actions and concepts, which continues to be refined and advocated for (Arievitch & Haenen, 2005;Arievitch & Stetsenko, 2000;Arievitch & van der Veer, 1995;Engeness, 2021;Engeness & Lund, 2020;Haenen, 2000Haenen, , 2001Karpov, 2013;Karpov & Haywood, 1998;Karpov & Kozulin, 2018;Kozulin et al, 2003;Lantolf & Poehner, 2014). The second is El'konin-Davydov's developmental education, which was refined by Davydov (1972Davydov ( / 19991988/2012 and also continues to be refined and advocated for (Aidarova, 1982;Chaiklin et al, 1999;de Araujo et al, 2020;Engeström et al, 1999;Hedegaard, 1996;Hedegaard & Chaiklin, 2005;Hedegaard & Lompscher, 1999;Kozulin et al, 2003Kozulin et al, , 2018Markova et al, 1974Markova et al, / 1979Schmittau, 2004;Venenciano et al, 2021;Zuckerman, 2004).…”