... 's Theory of Formal Reasoning and his Stages of Cognitive Development, it has also served as a foundation for others to build on. The Theory of formal reason works like a guideline to help us understand the cognitive development of infants throughout adolescents and even, to some extent, adults. Jean Piaget's Pendulum Study is one of the most straightforward methods that demonstrate how formal ... reasoning is measured. The purpose of this study is not only, as a student, to practice researching and analyzing data but it also serves to help gain practical experiencing conducting a study ...

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