1. Jean Paget
1.1. The theory of cognitive development was develop by Jean Piaget. A swiss psycholohist who lived in 1896 - 1980
2. Conclusion
2.1. The definition of cognitif theory itself is the theory that says that learning is a process of measures of preception and understanding that can be measures and observed
2.2. This model is more study oriented how students learn to think. For the most important teacher is how it can affect the development Of thinking and how teachers can adjust teaching with the level of cognitive development of students
3. Definition
3.1. Kognitif theory is a theory that examines how perception affects behaviour, and how experience influences perception by a learner
4. Development of Piaget Theory
4.1. The Sensory Motor
4.1.1. The motorized stage, or commonly called the sensory motor appears before development begin
4.1.2. At this stage intelligence has a structure based on behavior or movements & observation without language
4.1.3. Estimated age of the child at this stage from zero years to 2 years
4.2. Preoperative Stage
4.2.1. In this stage, children began to acquire language, which is symbols of speech
4.2.2. Preoperative stage is the stage of cognitive development that occurs between age 2 years to 7 years
4.3. Concrete operation stage
4.3.1. At this stage, children have also between able to arrange objects of the same size or weight, including the arragement and calculation of numbers
4.3.2. Concrete operation stage is the actual operation of concrete objects between the ages of 7 years to 12 years
4.4. Formal Operation Stage
4.4.1. At this stage is the operation stage proposition after 12 years old
4.4.2. Children have been able to think based on propositions or hypotheses & are no longer based on concrete object as in the previous stage