Psychologist Jean Piaget showed children two identical glasses filled with the same amount of water. After the children agreed that both glasses held the same amount of water, Piaget poured the water from one glass into a taller, narrower glass and then asked them about the amounts of water in each glass. Tamara noted that both containers still had the same amount of water, even though they were different shapes and sizes. This would indicate that Tamara is in the stage of cognitive development.

Concrete Operational

Explanation:

By Piaget's theory, concrete operational is the third stage of child development, and it lasts from 7 to 11 years.

We recognize that the example from the question is this stage as children during this age develop logical thinking about various concepts and events, become more organized, concrete when speaking and thinking, and are able to reason better. Children are still struggling with abstract concepts and ideas, but their logical thinking develops better.

By measuring how much water there is in the glass and realizing the amount is the same, Tamara shows the signs of clear, concrete logical thinking.

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