What is true about the stages of cognitive development according to Piaget?

The stages of cognitive development according to Piaget are characterized by a specific sequence that all individuals follow in developing their thinking abilities, regardless of the pace at which they progress through these stages. Each stage builds on the previous one, which means that the skills and understanding acquired in earlier stages lay the foundation for the abilities developed in later stages. This sequential progression is a fundamental aspect of Piaget's theory, emphasizing that cognitive development is not only qualitative but also orderly and universal across different individuals, although the age at which stages are reached can vary.

Other options suggest notions that contradict Piaget's framework. For instance, claiming that stages are completed by everyone by a certain age does not account for the variance in development and readiness. Suggesting that individuals can skip stages undermines the structured, cumulative nature of the theory. Finally, stating that stages become less complex inaccurately reflects the nature of cognitive development, which typically becomes increasingly sophisticated with age.