Which of the following is NOT a stage in Piaget's Cognitive Development Theory?

In Piaget's Cognitive Development Theory, the stages are well-defined and are critical for understanding how children progress in their cognitive abilities. The stages include:

• Sensorimotor Stage (birth to approximately 2 years)

• Preoperational Stage (approximately 2 to 7 years)

• Concrete Operational Stage (approximately 7 to 11 years)

• Formal Operational Stage (approximately 11 years and up)

The term "Abstract Operations" is not one of the recognized stages within this framework. Instead, the Formal Operations stage introduces the ability to think abstractly and logically, reflecting the transition into higher-order thinking. "Abstract operations" may imply similar skills but lacks the formal recognition and specific developmental implications that Piaget defined.

The other options—Concrete Operations, Formal Operations, and Preoperational Thinking—are all legitimate stages that illustrate distinct characteristics of cognitive development as children grow, each with its specific features and ways of thinking.