“…When the related literature on GI method were investigated, the applications generally provided a positive contribution to the students' academic achievement (Aksoy & Gürbüz, 2013;Mitchell, Montgomery, Holder & Stuart, 2008;Sangadji, 2016;Sancı & Kılıç, 2011;Şimşek, Doymuş & Karaçöp, 2008;Şimşek, Doymuş, Doğan, & Karaçöp, 2009;Tan, Sharan, & Lee, 2007;Zorlu, 2016). Additionally, there are studies that show positive effects on the student's learning process and learning outcomes (Astra, Wahyuni, & Nasbey, 2015: Hosseini, 2014, motivation and perceptions (Tan, Sharan, Lee, & Christine, 2007), attitudes toward the environment (Lazarowitz, Hertz-Lazarowitz, Khalil, & Ron, 2013), the teachers' attitudes toward the diversity of the individuals (Damini, 2014), understand the particulate structure of matter , and motivation (Tan, Sharan, & Lee, 2007) by applying GI method only once. There is no such study that was conducted to determine the effect of the GI method that applied twice.…”