The document summarizes Piaget's stages of cognitive development from infancy to adulthood in 3 sentences:
The sensorimotor stage from birth to age 2 is when infants learn about the world through senses and motor skills without using symbols. The preoperational stage from ages 2 to 7 is when children begin to use language and represent the world with symbols but cannot yet mentally manipulate ideas. The formal operational stage from ages 11 to adulthood is when abstract and logical thinking develops allowing hypothetical deductive reasoning and considering multiple possibilities.
