In his theory, Piaget argues that the acquisition of intelligence and knowledge is a never-ending process that requires assimilation and accommodation (Piaget & Inhelder, 1973).
He then describes the process of development. The first stage, he calls the sensorimotor stage and begins from the moment a child is born up to when they are two years old. At this stage, the child gets to understand and acquire the very basic knowledge of human life, which will later be useful as he grows up. Here, the child gets to understand the world he has just been born into by harmonizing his senses and what he experiences through them with physical actions (Santrock, 2008).