<![CDATA[This study was motivated by the low understanding of measurement concepts among 5–6-year-old children at KB Al-Iqro, Sajira District, Lebak Regency. The study aimed to improve children's understanding of measurement concepts through realia media. The research employed Classroom Action Research using the Kemmis and McTaggart model and was conducted in two cycles. The participants were 14 children in Group B. Data were collected through observation, field notes, and documentation and analyzed using qualitative and quantitative procedures based on achievement percentages. The results showed an increase in children's measurement ability from 18.46% at the pre-action stage to 56.77% in Cycle I and 84.66% in Cycle II. The improvement was observed in measuring objects, comparing length, selecting and grouping objects according to size, estimating or comparing weight in simple activities, and comparing water volume. These findings indicate that realia media can provide concrete experiences that help children connect measurement concepts with familiar objects and everyday situations. Therefore, the planned and gradual use of realia media can be an alternative instructional strategy for strengthening measurement concept understanding among 5–6-year-old children]]>
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