<![CDATA[The problem that is the focus of this research is that the logical thinking ability of children aged 5-6 years at TKIT Lampu Iman Karawang is still weak in logical thinking, especially in the ability to classify objects, recognize patterns, sort, and compare. This study measures children's logical thinking before and after using mechanical construction blocks, and tests whether the medium produces a measurable effect. The design is quantitative, pre-experimental, one-group pretest-posttest, with 18 Group B children chosen by proportional random sampling from a population of 49. Observation, interviews, and documentation supplied the data; Shapiro-Wilk tested normality, Levene's test checked homogeneity, and a paired-sample t-test (IBM SPSS Statistics 29) analyzed the results. The mean score rose from 31.2 on the pretest (Mulai Berkembang) to 42.5 on the posttest (Berkembang Sesuai Harapan). The paired-sample t-test returned t = -15.296, p = 0.001, rejecting H0 and supporting Ha. Mechanical construction blocks produce a significant positive effect on logical thinking in children aged 5-6 at TKIT Lampu Iman Karawang.]]>
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