Piaget was the first to expose that children think differently at different stages in their lives. Piaget believed that all children development through four different stages of cognitive development. These stages include sensori- motor, pre-operational, concrete operational and formal operational. The sensori-motor stage is characterized by an infant’s discovery of themselves and their environment. During this stage, infants learn object permanence which is the knowledge that an object occur even if they do not see it. In Piaget’s Preoperational stage, children ages 2-7 …show more content…
(e.g., Bidell, 1988; Glassman, 1994). According to the article some of the similarities that Piaget and Vygotsky share are “an emphasis on action, a primary of processes over external contents or outcomes and a focus on the qualitative changes over the quantitative ones.” According to the authors who included the resemblances amongst Piaget and Vygotsky, they considered that a developmental viewpoint is important for understanding of the psychological phenomena and processes. For an example the case of Piaget's mental operations, formal operations for instance (Inhelder & Piaget, 1958; Piaget, 1947), and of Vygotsky's