<![CDATA[Low student achievement and limited interactive digital media remain challenges in learning lathe machine parts at vocational schools. This study developed and examined the effectiveness of an interactive flipbook e-module using Heyzine to improve Grade XI Machining Engineering students’ learning achievement at SMK Satya Praja 2 Petarukan. The study employed a Research and Development (R&D) design using the 4D model, followed by a quasi-experimental pretest-posttest control group design involving 60 students, with 30 in the experimental group using the interactive e-module and 30 in the control group using printed textbooks. Expert validation indicated that the e-module was highly feasible (CVI = 0.96; Agreement = 97%). The achievement test comprised 25 valid and reliable items (Cronbach’s α = 0.848). Data were analyzed using an independent-samples t-test for posttest scores and a Mann-Whitney U test for N-Gain scores. The pretest showed no significant difference between groups (p = 0.134). Posttest results indicated a significant difference (t = 3.273, df = 58, p = 0.002), with higher mean scores in the experimental group (78.93) than in the control group (69.86). The effect size was large (Cohen’s d = 0.84). N-Gain was moderate in the experimental group (0.38) and low in the control group (0.15), although the difference was not significant (U = 416.500, Z = -0.497, p = 0.619). The interactive flipbook e-module significantly improved posttest achievement with a large practical effect compared with printed textbooks.]]>
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