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Cognitive development
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==== Concrete operational stage ==== Piaget believed that the concrete operational stage spanned roughly from age 6 through age 12. This stage is marked by the development and achievement of skills such as [[Conservation (psychology)|conservation]], classification, serialism, and spatial reasoning. Work suggesting that much younger children reason about abstract ideas including [[Categorization|kinds]], [[Logical connective|logical operators]], and causal relationships rendered this aspect of stage theory obsolete.
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