According to Jean Piaget, at which stage do children begin abstract thinking and logical reasoning?

→ Which of the following psychological statements is most authentic and scientifically valid regarding the real psychological implications of 'Decentration'—a central concept under Jean Piaget's Theory of Cognitive Development defined as the advanced cognitive ability where a child can simultaneously consider, understand, and coordinate multiple aspects or dimensions of an object or situation rather than focusing on only one aspect, dimension, or feature (Centration)—and its scientific operation for students' multi-dimensional perspective, logical conservation, and cognitive flexibility in classroom teaching? → Under Jean Piaget's theory of cognitive development, when analyzing the capabilities of 'Hypothetico-Deductive Reasoning' and 'Combinatorial Thought' that develop in adolescents entering the 'Formal Operational Stage', which of the following statements most accurately defines the ontological and cognitive characteristics of this stage? → According to Piaget, in which stage of cognitive development does a child understand the concept of 'conservation'? → According to Jean Piaget's theory of cognitive development, what is the age range of the 'formal operational stage'? → According to Jean Piaget's theory of cognitive development, what is the age range of the 'Formal Operational Stage'? → The four stages of children's intellectual development (sensorimotor, preoperational, concrete operational, and formal operational) were identified by whom? → According to Jean Piaget's theory of cognitive development, what is the age range of the 'Formal Operational Stage'? → According to Jean Piaget's theory of cognitive development, what is the age range of the 'Concrete Operational Stage'?