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This study aims to determine the cognitive development of children aged 11 years in completing concrete operations according to the stages of Piaget's cognitive development, namely: sorting, classification, reasoning, understanding, conservation, and eliminating egocentrism. This research needs to be carried out as a reference for teachers in providing appropriate learning methods, namely by knowing the extent to which the abilities of each student are seen from their cognitive abilities. The subjects of this study were seven children aged 11 years. The data was collected by means of interviews, tests and documentation. Data analysis was carried out by using the case study method by looking at the results of student activities and by drawing conclusions. Based on the research results of the seven children, there were 2 children who were unable to complete several concrete operational stages according to Piaget's cognitive development.

Analisis Teori Perkembangan Kognitif Piaget Pada Anak Usia 11 Tahun Di Brebes