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The understanding that quantity is NOT related to the arrangement and physical appearance of objects.

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Children who do not understand conservation believe that the amount of liquid changes as it is poured between two different sized glasses.

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When two rows of pennies are presented to preschoolers, the children usually state that the lower row in the second picture contains more pennies because it looks longer.

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Modality - Number of elements in a collection.
Change in appearance - rearranging or dislocating elements.

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Piaget - Number conservation task (Preoperational and Concrete Operational Stages)

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Modality - Amount of malleable substance such as liquid or clay.
Change in appearance - Altering shape

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Modality - Length of line/object.
Change in Appearance - Altering shape/configuration.

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Modality- Amount of surface that is covered.
Change in appearance - Rearranging the figures.

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Modality- Weight of an object.
Change in appearance - Altering the shape.

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Modality - Volume of an object in terms of water displacement.
Change in appearance - Altering the shape.

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6-7 years old

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7-8 years old

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7-8 years old

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8-9 years old

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9-10 years old

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14-15 years old

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Piaget's Four Stages of Cognitive Development 

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Piaget's Four Stages of Cognitive Development 

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1. Sensorimotor (0-2 years old) - Experiencing the world through senses and actions.
2. Preoperational Stage (2-7 years old)- Uses intuition as opposed to reasoning.
3. Concrete Operational Stage (7-11 years old)- Thinks logically about concrete events.
4. Formal Operational (12 years old - adulthood) - Uses abstract reasoning.

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Conservation in Terms of Piaget's Stages

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Conservation in Terms of Piaget's Stages

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There is a lack of conservation among children in the preoperational stage (ages 2-7). Understanding of conservation occurs throughout the concrete operational stage (ages 7-11).

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Why do children make mistakes with conservation?

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Why do children make mistakes with conservation?

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Children in the preoperational stage lack the understanding of conservation because the concept of centration prevents children from focusing on relevant features of the object/situation.

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Jean Piaget