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Piaget's three mountain task, in which a child judges a doll's view of a model, tests for:

AEgocentrism
BConservation
CClass inclusion
DSeriation
Answer & Solution
Correct answer: A. Egocentrism
1. A child sees a model of three mountains, and a doll is placed at another viewpoint. 2. The child must pick the picture that shows what the doll sees. 3. Preoperational children pick their own view, showing they cannot take another's perspective. 4. So the task was designed to test **egocentrism**. **Why not the others:** Conservation, class inclusion and seriation are tested with clay, liquids, counters, groups of objects or sticks, not viewpoints. _Source: Wikipedia, "Three mountain problem", section "introduction" (revision 1344091865)_
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