Brenda (2010) mentioned in this sub-stage, the infants will be doing the same actions but it extends out to the environment such as replacing sucking their thumbs with rubber toys.
In other words the infants are having improvement in their reactions.
Ormrod (2011) stated that organization is possibility of a person to handle their process of thinking.
It is also called as schemes which means the building block of intelligent behavior.
Moreover, in fourth sub-stage which is coordination of reactions from the age of 8 to 12 months.
They will begin to show clear actions and observe others behavior other than starting to develop ability in recognizing the things that had been shown to them.According to Krause et al.,(2007), infants in this stage will begin to develope their reflexes by doing some motor activities and senses.They are trying to understand the world around them. Besides,the author reported that Piaget did observing his own children and attracted to changes that occured and developed in children’s mind and the factors behind these changes. As we know, the famous theory of cognitive development was found by Jean Piaget. Newkirk also mentioned that Piaget was a theorists and also a biologist.Next, primary circular reactions sub-stage is when the infants are 1 to 4 months. For instance, infants are sucking his or her thumb, and as a result they will repeat the same actions because it pleasure them.As it goes on, third sub-stage is secondary circular reactions which occured during 4 to 8 months.The authors too found that Piaget and his theory are important because he is the first theorists that came out with such theory about development of children from the aspect of cognitive and his idea is still be using untill now even though it has been years.Self development is very important in children’s life because it develop in them while they are growing up.As children are developing, their way of thinking started to change from time to time accordingly to the four stages.Piaget was not really interested into the knowledge having by the children but he was more fascinated by the way of children think, observe their surrounding and how they express it into speeches (Krause et al., 2007).