This study aims to assess the effectiveness of online learning implemented in Grade XI classes at SMK Muhammadiyah 1 Baturetno. A descriptive quantitative research design was employed, utilizing questionnaires for data collection. The study population consisted of 240 Grade XI students at SMK Muhammadiyah 1 Baturetno; applying Slovin's formula resulted in a sample size of 71 students. Data were collected via a questionnaire comprising 17 items, finalized after instrument testing. The findings indicate that online learning at SMK Muhammadiyah 1 Baturetno cannot yet be considered fully effective, as there remain numerous aspects requiring improvement or refinement to achieve true effectiveness in online instruction.
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