Abstract
Abstract Recent controversy over Piagetian tasks concerns whether the experimenter's actions result in children misunderstanding the question. Evidence for this has been derived from differences in performance of conservation tasks according to whether the transformation is intentional or accidental. Studies reporting large differences according to transformation type are claimed to be flawed procedurally. Including a preliminary talk and restricting questions to one domain result in little or no transformation type effect. Whether children's correct judgments in accidental versions are reliable indications of their knowledge has also been disputed. They may reflect children's ignoring of the transformation or covert counting. Using an identity conservation pretest 192 Yemeni children were selected to be tested on number conservation tasks varying in transformation type, numerosity and equality. The results were analysed using a model‐fitting procedure. Identity nonconservers were affected by transformati...
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