From a baby to an adult, the mental of human are changing continuously due to the demographic (age, gender, and education) and environmental factor (family influence and society influence). There are many types of cognitive development theory that use to prove the human’s mental stages of changing. In cognitive development theory, the theory that is focused on is Piaget’s theory of cognitive development. Piaget’s theory, which is the children cognitive development, is through four single stages for testing all children commonly. This is used to recognize the ways of development factors that affect children’s grief. Before developing the children cognitively, Piaget uses three common ways to question the children (Chaplin & Krawiec, 1988). The first way is to ask the question about his or her relation to another people, to expected occurrences and to setting object. For example, “where do you come from?”, “why must study?” and “who are your mother and father?” Second method is half spoken and half physical. This is designed to determine the understanding of the children to the natural environment and the phenomena of their growing process. The last method is primarily physical which makes them to ask about the causes and effects of the situation. Thus, they are more intelligent and can also find ways to solve problems after explanation is given by the people who teach them. For example, a child was shown a pizza is baked by the coal oven. The coal has been burned and the heat is produced. Burning generates heat which bakes the pizza until the pizza can be served. According to Feldman (1992), “Piaget’s theory is taking an interactionism point of view, he suggested that movement from one stage to the next occurred when the child reached an appropriate level of maturation and was exposed to relevant types of experience” (p. 321). Piaget’s theory can be divided into four stages of cognitive development in child:
References: Ballantyne, F. P. (n.d.) History of psychology course. Retrieved May 4, 2013 from http://www.igs.net/~pballan/Piaget%28Stages%29.htm Chaplin, J Charlesworth, S. J. (n.d.). An examination of piaget’s theory of human development. Retrieved May 4, 2013 from http://www.academia.edu/1574017/An_examination_of_Piagets_Theory_of_Human_Development. Cherry, K. (n.d). Formal operational stage of cognitive development. Retrieved May 8, 2013, from http://psychology.about.com/od/piagetstheory/p/formaloperation.htm Cherry, K Felman, R. S. (1992). Element of psychology. United State of America: McGraw-Hill, Inc. McLeod, S. A. (2010). Formal Operational - Piagetian Stage. Retrieved from http://www.simplypsychology.org/formal-operational.html MedlinePlus Medical Encyclopedia Ojose, B. (2008). Applying Piaget’s theory of cognitive development to mathematics instruction. The mathematics educator, 18(1), 26-30. Wood, S