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2010), infants enter the world with set of simple coordination which we called 'reflexes'. One example of this is the sucking reflex when a child nurses from the mother. Later, when the infant is growing up, his reflex actions will be translated to goal-directed actions through several repetition activities. At this stage, a child develops object permanence, the understanding that objects exist whether they perceive them or not. During this time also, a child learns through imitation from his pre-exist surrounding.

Preoperational stage

This second stage of the theory is known as the preoperational stage spanning from the period of two to seven years old. According to Axelrod (1999), children are able to manipulate environment symbolically through inner representation by using word, gestures, images and signs. There is drastic development in language and thinking skills. Piaget believed at this stage a child is moving toward mastery but has not fully mastered the mental operations. Another unique characteristics developed during this stage is Egocentrism. The concept of egocentrism means children see the world from their viewpoint and not able to consider other people's viewpoint.

Concrete Operational stage

This stage spans from the age of seven to eleven years old. At this age, a child has developed mental operations that allowed them to see and treat the physical world in logical and systematic order. A child at this age is able to provide justification by mastering conservation. According to Mitchell (2004), Piaget had indentified three important operations in conservation process:

i) Compensation: Changes in one direction can be compensated by changes in another direction.
ii) Identity: If nothing is taken away or added, the material remains the same.
iii) Inversion: If the entire process is reversed, the quantity of the materials remains the same.

At this point, a child is able making an orderly and sequential arrangement of an object based on size, weight or volume. This process is known as seriation which enable a child to construct logical series such as arranging object from small to large or vice-versa.

Formal Operation stage

This is the last stage of Piaget's developmental theory. This stage ranges from eleven years to adulthood. According to Mitchell (2004) 'formal' as used by Piaget mean well-mannered etiquette. Children at this stage, capable of systematic reasoning about things which take hypothetical form without having to see concrete objects. Students at this level are able to solve science experiments such as the 'pendulum problems'. They are also able to solve algebra problems by using deduction method to derive at certain value. Adolescent at this age, exhibit a phenomena known as adolescent egocentrism. According to Stuart-Hamilton (2006), study conducted by Piaget examined, egocentrism does not refer to selfishness, rather a child's immaturity that whatever he or she can see is the viewpoint of everyone else as well. This is the feeling that they are the centre of attraction and leads to false sense of security, eventually increasing risk taking behaviour like participating in illegal racing, experimenting with dru本论文由英语论文网提供整理，提供论文代写，英语论文代写，代写论文，代写英语论文，代写留学生论文，代写英文论文，留学生论文代写相关核心关键词搜索。