<![CDATA[The purpose of this research is to describe teacher activity, analyses children activity and the cognitive development. The approach of this research uses approach qualitative with types of classroom action research, implemented with 4 meetings, the research setting in group B consisted of 14 children. Data collection techniques used observation, documentation and interviews. as well as assessment of cognitive development outcomes. The analysis of this research data applies technique descriptive analysis and cross tabulation which is described through tables, graphs and interpretation through presentation. This study aims to describe teacher activities, children's activities and cognitive aspects in classifying object based on color, shape and size using problem-based learning model, demonstration method and smart box media. The results of the study showed that teacher activities with very good category, children's activities are getting very active category and cognitive development results get the category developing very well]]>
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