“…All the implementations were parallel with the following studies in terms of their results that project-based activities increased student achievements: Baş (2011), Dağ andDurdu (2011), Değirmenci (2011);Deniş Çeliker (2012), Doğay (2010), Gözüm et al (2005), Karaçallı (2011), Kaşarcı (2013, Özer and Özkan (2010), and Yıldırım (2011); that grouping according to skills into homogenous groups increased gifted students' academic achievements: Agbayewa (2011), Hoffer (1992), Kulik and Kulik (1982); that teaching based on multiple intelligences increased students' academic achievements: Altınsoy (2011), Altun (2009), Elmacı (2010, Gözüm (2011), Sivrikaya (2009), Şirin (2010, Uzunöz andAkbaş (2011), Yalmancı andGözüm (2013); that teaching applications based on creative thinking increased students' academic achievements: Kadayıfçı (2008), Kök (2012), Kurtuluş (2012), Özcan (2009Özcan ( ), Özerbaş (2011Özcan ( ), Scott et al (2004; that teaching based on enriched activities increased students' achievements: Beecher and Sweeny (2008), Coyne and Fogarty (2007), Fakolade and Adeniyi (2010), Kirkey (2005), Luehmann (2009), OlszewskiKubilius and Lee (2004), Singh (2013); and that curriculum differentiation increased students' achievements: Beecher and Sweeny (2008), Colson (2008), Kadum-Bošnjak and Buršic-Križanac (2010), Kirkey (2005), Ma...…”