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At the top of the image is a box with the words: Piaget’s cognitive stages of development. From this box are four arrows leading to four boxes with the following text. From left to right, box 1: Sensorimotor (0–2 years); box 2, Preoperational (2–7 years); box 3, Concrete operational (7–11 years); box 4, Formal operational (adolescence–adult). Below each box is a picture of a child. Below box 1, a child crawling; box 2, a child approximately 6 years old; box 3, a 10-year-old child; box 4, a teenager.

 Developmental theory