Table 2 Distribution of papers among subjects of studies

CS/IT

20 (39%)

(Amriani, Aji, Utomo, Wahidah, & Junus, 2014 ^a; Anderson, Nash, & McCauley, 2015; Auvinen, Hakulinen, & Malmi, 2015; Bernik, Bubaš, & Radošević, 2015; Codish & Ravid, 2014; Codish & Ravid, 2015; Hakulinen, Auvinen, & Korhonen, 2015; Herbert, Charles, Moore, & Charles, 2014; Ibanez, Di Serio, & Delgado-Kloos, 2014; Knutas, Ikonen, Maggiorini, Ripomonti, & Porras, 2014a; Knutas, Ikonen, Nikula, & Porras, 2014b; Krause, Mogalle, Pohl, & Williams, 2015; Laskowski & Badurowicz, 2014; Leach, Laur, Code, Bebbington, & Broome, 2014; Lehtonen, Aho, Isohanni, & Mikkonen, 2015; Poole, Kemp, Patterson, & Williams, 2014; Sillaots, 2014; Sillaots, 2015; Smith, Herbert, Kavanagh, & Reidsema, 2014; Tvarozek & Brza, 2014)

Math

5 (10%)

(Attali & Arieli-Attali, 2015 ^a; Christy & Fox, 2014; Long & Aleven, 2014; Paiva et al., 2015 ^a; Pedro, Lopes, Prates, Vassileva, & Isotani, 2015b) ^a

Multimedia/Communication

6 (12%)

(Barata, Gama, Jorge, & Gonçalves, 2014; Hanus & Fox, 2015; Holman et al., 2015; Jang, Park, & Yi, 2015; Leach et al., 2014; Utomo & Santoso, 2015)

Medicine/Biology/Psychology

5 (10%)

(Bonde et al., 2014; Landers & Landers, 2015; Nevin et al., 2014; Pettit, McCoy, Kinney, & Schwartz, 2015; Su & Cheng, 2015) ^a

Languages

4 (8%)

(Hasegawa, Koshino, & Ban, 2015; Hew, Huang, Chu, & Chiu, 2016; Perry, 2015; Smith et al., 2014)

Others

11 (21%)

(Barrio, Organero, & Soriano, 2015; Boticki et al., 2015 ^a; Chang & Wei, 2015; Davis & Klein, 2015; Lambruschini & Pizarro, 2015; Mekler, Brühlmann, Tuch, & Opwis, 2015; Morschheuser, Rivera-Pelayo, Mazarakis, & Zacharias, 2014; Pedro, Santos, Aresta, & Almeida, 2015a; Shi, Cristea, Hadzidedic, & Dervishalidovic, 2014; Sillaots, 2015 ^a; Tu, Yen, Sujo-Montes, & Roberts, 2015)