Robert S. Siegler studied changes in children’s problem-solving strategies using the microgenetic method. Repeated observations during arithmetic learning compared performance, response times and reported strategies. Trial-level changes can reveal a developing shortcut that a single pretest and posttest would miss, while verbal awareness and successful strategy use remain different measurements. [ref]
Conscious and unconscious strategy discoveries: a microgenetic analysis by Robert S. Siegler and others. 1998, arithmetic shortcut discovery and trial-level observations
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