Pekka Räsänen investigated interventions for children with low numeracy. Randomizing children between two numerical games allowed the study to compare particular training arrangements and subsequent outcomes. Improvement on practiced material and transfer to a wider numerical ability are different questions, so both the training content and the outcome task are needed to interpret an intervention. [ref]
Computer-assisted intervention for children with low numeracy skills by Pekka Räsänen and others. 2009, randomized numerical-game comparison
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