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Introduction: This lesson will look at three theories on cognitive development. The first theory we will discuss is Piaget's. Piaget believed that children actively construct their development by adapting their existing knowledge to new situations. We will look at how this unfolds in Piaget's four stages of development. We will then look at quite a different aspect of cognitive development in the second theory by Vygotsky. Vygotsky believed that cognitive development is mediated by sociocultural factors, and that the zone of proximal development refers to what children can achieve with and without help. The third theory we will look at is information-processing. Information-processing compares our minds to computers, and concentrates on cognitive processes, memory, reasoning and problem-solving. Finally, we will look at how our minds differ from computers because of our awareness of what we know and how we know - an awareness known as metacognition. Need Assignment Help?