“…Their research has established that children, both primary and middle-school aged, can verbally articulate arguments in the form of proof by cases; induction; upper/lower bound and contradiction (Maher & Martino, 1996;Maher & Davis, 1995). The justifications that students produce may result from their coordinated efforts to make sense of the problem, notice patterns, and pose hypotheses (Mueller et al, 2012;Maher & Martino, 2000). Research has established that students continue in their efforts to refine their solutions through discussions, as they negotiate meaning with other students and structure their own investigations (Weber, Maher, Powell, & Lee, 2008;Maher, 2005).…”