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Public Works with the development of which we live when this is certainly not to be separated from cognitive development man that is increasing from day to day. cognitive development itself will focus on ways of thinking, problem solving, memory, and order. With all activities that digestion of course was accompanied by a sophisticated technologys one tool that helps a work can run smoothly and in the end reached on a point success. Is clear evidence Technology sophisticated of the developments cognition to be implemented to meet the need for days. With the development cognition, means we touched a little bit about how the process cognition early stages of cognition to can increase. Cognition man, in terms of development that started since the year-end of the very beginning in the first stage growth that there is a perception, memory, language, and the process we think is controlled by the genetic structure that we had inherited and changes that we experience as a response to demand environment which appeared in various interaction physical and social. Of course, different from cognition between adult male cognition with a toddler. One under five would not be able to interpret a verse or think logically like what was done by a male adults in general. As it was raised by Piaget about two main principles in cognitive development organization and adaptation. Piaget also makes a theory of the four same page in cognitive development, which showed that the development intelectuality man. As for the four same scratched by Piaget as follows:

1. Step 1: same sensorimotor ( since birth - 2-year-old )

2. Step 2: pre-operational ( age 2 - 7 year)

3. Step 3: operation period concrete ( age 7- 11 year)

4. Step 4: operation period formal ( a teenager and adults )

changes in the same period is generally were quantitative and linear, while the difference between same tend to be qualitative and shows progress from the same one series to the others in the fourth period. One of the children had to go through a period before increased to a period next. It is clear that cognition children under five adult male is different from various aspects, including the experience. Adult male receive more experience rather than five children who have not yet received the information so much experience that it receives no better than adult male. Then, train children from as early as possible with instruction that cognition children can grow with good and motivating children to become a person who has expertise in quality for his works that can be useful for many people.

Source: Solso, Robert L. et al. (2007).  Cognitive Psychology. Erlangga. Jakarta.