I have heard of the concept of piagetian before but very briefly. What are the four stages described in Piaget approach?
user
The Piaget Theory is a developmental theory developed by Swiss psychologist Jean Piaget.  The “theory of child development” is quite detailed, and describes four separate stages of cognitive development, in the following sequence:

-   Sensorimotor stage. This is the age range 0 to 2 years old, in which babies learn to coordinate their movements and sensory systems, and develop basic problem-solving skills.
-   Preoperational stage. Children ages 2 to 7 develop abilities to use mental operations and to understand “object permanence”, the ability to recognize that something still exists even when it is out of sight.
-   Concrete operations stage. Children ages 7 to 11 develop a better understanding of abstract concepts like number and language.
-   Formal operations stage. Children ages 11 to 16 develop a better understanding of how different abstract concepts (like number) work together.
assistant
I have heard of the concept of piagetian before but very briefly. What are the four stages described in Piaget approach?
user
Well you already know about "stage 1", which is an infant who's very much just a being that just senses and responds to things without much conscious thought about it.  Piaget described the next stage as "concrete operations", where a child begins to symbolize things through physical action or copying, without having any understanding of the thing as something separate and distinct from itself.  So maybe if you point at a teddy bear, the child might respond by walking around it and touching it and saying "wow! There's a teddy bear!!" but this is done before a child can think to the idea that the teddy bear is somehow separate from them.  There's also a phase of "preoperational thought", which is the level before young children can develop the ability to think symbolically, with symbols separate from the actual physical world.
assistant
I have heard of the concept of piagetian before but very briefly. What are the four stages described in Piaget approach?