“…Hattie's meta-research (2009) provides a synthesis of these studies and highlights the main conclusions , Evain, De Marco, & Gutierrez, 2013, Evain, De Marco, & Carolan, 2013. Trujillo (2002) classifies methods according to what they aim to promote: discovery learning, student team learning, learning together, and group investigation and concludes that "the differences between each method are the degree of structure in the task, the use of rewards, and individual assessment methods" (p. 8).…”