The validity of verbal reports in children's subtraction

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Microgenetic Analyses of Learning (2007, background): “Since the publication of Ericsson’s and Simon’s seminal book, a great deal of evidence has supported their conclusion (Crutcher, 1994; Robinson, 2001; Siegler, 1987; 1989).”
REACTIVITY AND TYPE OF VERBAL REPORT IN SLA RESEARCH METHODOLOGY: Expanding the Scope of Investigation (2005, background): “…or aptitudes differ, with some patterns facilitating and others inhibiting learning and performance under certain conditions, or on certain tasks ~P+ Robinson, 2001!, it stands to reason that abilities and aptitudes might also affect verbalization under different conditions and on different…”
Children's Learning (2009, unknown): “4”
The Process of Probability Problem Solving: Use of External Visual Representations (2010, background): “However, several decades of research has supported the validity of data from think-aloud protocols in investigating mathematics problem solving, even with elementary school students (e.g., Ericsson & Simon, 1993; Robinson, 2001).”