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All Journal Jurnal Pendidikan Teknologi dan Kejuruan
Aprilia Eka Salwa
Department of Mechanical Engineering, Faculty of Engineering, Universitas Negeri Padang, Indonesia
Education Engineering

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Problem-based learning in orthogonal projection drawing: A quasi-experimental study on vocational machining students’ technical drawing achievement Aprilia Eka Salwa; Syahril Syahril; Eko Indrawan; Gulzhaina K. Kassymova
Jurnal Pendidikan Teknologi Kejuruan Vol 9 No 2 (2026): Regular Issue
Publisher : Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/jptk.v9i2.50323

Abstract

This study examined the implementation of Problem-Based Learning (PBL) and its effect on Grade X Machining Engineering students’ cognitive achievement in Technical Drawing, particularly orthogonal projection. The study used a quantitative quasi-experimental design with a non-equivalent control group. The participants were 70 students at SMK Negeri 5 Padang, divided into an experimental class taught using PBL and a control class taught using conventional instruction. Data were collected through pretest and post-test scores using a validated multiple-choice test on orthogonal projection. The final instrument consisted of 28 valid items with a KR-20 reliability coefficient of 0.914. Descriptive statistics, Shapiro-Wilk normality tests, Levene’s homogeneity test, and an independent samples t-test were used for data analysis. The results showed that both groups improved after instruction, but the experimental class achieved a higher increase. The mean score of the experimental class rose from 53.57 to 79.28, while the control class increased from 53.67 to 64.29. The t-test showed a significant post-test difference between groups, t (68) = -10.152, p < 0.001. These findings indicate that PBL supports stronger cognitive achievement in orthogonal projection learning by engaging students in investigation, discussion, presentation, and evaluation. The findings directly recommend PBL for visual technical topics in vocational classrooms.
Co-Authors Eko Indrawan Gulzhaina K. Kassymova Syahril Syahril