What is NOT one of the stages defined in Piaget's theory?

In Piaget's theory of cognitive development, there are four established stages that outline how children's thinking evolves as they grow. These stages are the sensorimotor stage, the pre-operational stage, the concrete operational stage, and the formal operational stage.

The pre-operational stage occurs from approximately ages 2 to 7, where children begin to engage in symbolic play and learn to manipulate symbols, but they do not yet understand concrete logic. The concrete operational stage follows, typically from ages 7 to 11, during which children start to think logically about concrete events but struggle with abstract or hypothetical concepts. Finally, the formal operational stage emerges in adolescence, around age 12 and onward, where individuals can think abstractly, reason logically, and plan systematically.

The term "transitional operational stage" is not recognized in Piaget's framework, which is why it is identified as the correct answer. This label does not correspond to any official stage within his model, indicating a misunderstanding or misinterpretation of his theories.