SUPARJI SUPARJI

Cost estimation (Rencana Anggaran Biaya, RAB) is a course that demands careful calculation and an understanding of how costs arise in real projects. An initial observation at SMK Negeri 1 Baureno found that roughly 63% of students grasped and could apply RAB concepts. This research examines whether industrial internship (Prakerin) experience and learning motivation, individually and jointly, influence the RAB learning outcomes of Building Modeling and Information Design (DPIB) students. It adopts an associative quantitative approach with an ex post facto design. Purposive sampling selected 68 twelfth-grade students who had finished their internship. Four-point Likert questionnaires measured Prakerin experience and learning motivation, while a multiple-choice test and grade records supplied the outcome data. Classical assumption tests and multiple linear regression were run in SPSS. Prakerin experience had a significant positive effect on outcomes (B = 1.137, t = 2.717, p = 0.008); the effect of motivation was positive but not significant (B = 0.782, t = 1.754, p = 0.084). Together, the two variables had a significant effect (F = 44.231, p < 0.001), explaining 57.6% of the variance. Schools should improve internship quality and link students' industry experience to RAB teaching