“…Many studies targeting learning outcomes of group study have focused on structured collaborative learning—that is, class- or assignment-specific group work that is to some degree teacher-driven (e.g., Cai, 2013; Chen & Chen, 2015; Colbeck, Campbell, & Bjorklund, 2000; Johnson, 2006; Ounnas, Davis, & Millard, 2009; Phipps, Phipps, Kask, & Higgins, 2001; Springer, Stanne, & Donovan, 1999; Tanner, Chatman, & Allen, 2003). Whereas a vital component of collaborative learning is that a group of students are working together to achieve a common academic goal (Gokhale, 1995), it is important to note that our operational definition for group studying allows for a more global interpretation: a group study session involves two or more students, takes place outside of class time, and does not include supplementary instruction led by teaching assistants or tutors.…”