“…Importance of group work and collaboration among children was highlighted in many studies. Different ways to arrange the collaboration were tried out, for instance group members allocating different roles to each other by themselves [73], engaging in idea sharing, discussion and negotiation [20,49,12,79,78,76,70,57], overcoming problems by observing each other [85,57], more experienced children assisting less experienced ones (peer mentoring) [70], nomination of some children by their peers as 'experts' [86], grouping children based on knowing each other [41], or on different range of interests and skills [57] or letting children to choose their partners freely and interacting with others openly [51]. Building of community through uninterrupted natural group collaboration among children was also tried out, children playing both the roles of a teacher and a learner [74].…”