Do the quantity of an object remain the same despite the change of its appearance (Conservation)?
Younger children can cope better if they were asked only one question rather than two questions pre- and post-transformation.
Piaget may have underestimated what younger children can do because using two questions confused them.
Samuel & Bryant's partial replication of Piaget's experiment
3 conditions:
1. Standard condition -two questions (least errors)
2. One judgment condition - one question
3. Fixed array control (most errors)
3 types of conservation task
1. Conservation of volume (hardest)
2. Conservation of mass
3. Conservation of number (easiest)
252 children from Devon
5 (more errors), 6, 7, 8-year-olds (fewer errors)
Applications, validity & reliability issues
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