“…Some research on collaboration focuses on the benefits of pooling cognitive resources (Kirschner, Paas, & Kirschner, 2009, 2011, since two people have more cognitive resources between them than one person working alone and may also possess complementary knowledge (Johansson, Andersson, & Rönnberg, 2005). Other research suggests that collaboration changes learners' cognitive processes by increasing their use of explanation (Hausmann, Nokes, VanLehn, & van de Sande, 2009;Hausmann, van de Sande, & VanLehn, 2008;Okada & Simon, 1997) and generation of abstract representations (Schwartz, 1995;Shirouzu, Miyake, & Masukawa, 2002). Still other evidence shows that collaboration can improve metacognitive awareness (Larkin, 2006), increase metacognitive behaviors (Whitebread, Bingham, Grau, Pino Pasternak, & Sangster, 2007), and support error monitoring and correction (Brodbeck & Greitemeyer, 2000;Gadgil & Nokes-Malach, 2012;Hall, Dansereau, O'Donnell, & Skaggs, 1989).…”