The abstract and prosedural character of Algorithm and Programming material often makes it difficult for students to grasp without an interactive medium to support comprehension. At SMKS YPM 4 Taman, classroom instruction had relied mainly on printed modules and verbal explanation, leaving many students with only a partial grasp of the subject. This study set out to examine how the simulation feature embedded in Codin, a web-based learning medium, influences students' cognitive learning outcomes on the Algorithm and Programming element. Forty-five Grade X RPL students at SMKS YPM 4 Taman took part as research subjects, with data gathered through a pre-experimental, one-group pretest-posttest design. The collected data were processed using the Shapiro-Wilk normality test, a Paired Samples T-Test, and an N-Gain calculation. Both pretest and posttest scores were found to be normally distributed, with p-values of 0.063 and 0.408. The Paired Samples T-Test produced a p-value of 0.001, below the 0.05 threshold, pointing to a meaningful rise in cognitive learning outcomes once Codin was introduced. This rise was echoed in the N-Gain result, which averaged 0.689 and fell within the moderate category.
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