alleryA child judges juice in a tall thin glass by noting both its height and its narrowness. This ability is:
AReversibility
BCentration
CDecentration
DSeriation
Answer & Solution
Correct answer: C. Decentration
1. The child attends to two features (height and width) at the same time.
2. Focusing on more than one feature of a problem at once is **decentration**.
3. Decentration replaces preoperational centration and allows conservation.
4. So this concrete operational ability is decentration.
**Why not the others:** Centration is the opposite (one feature only). Reversibility is undoing an action in the mind, which the child is not doing here.
_Source: Wikipedia, "Piaget's theory of cognitive development", section "Testing for concrete operations" (revision 1379038101)_
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