What is "in stages?"

"In Stages" is a psychological theory that pertains to the process of development. The theory suggests that people go through different stages in their lives, and that these stages can influence their behavior.

The theory was first proposed by psychologist Erik Erikson in the 1950s. Erikson believed that the stages of development were: prenatal, early childhood, middle childhood, late childhood, adolescence, and young adulthood. He believed that each stage had its own set of challenges and opportunities.