Özet:

The study aimed to determine the benefits of Project OSO: Online, Shareable, and Offline video lectures to seventh-grade students during Flipped Classroom implementation to resolve the untaught mathematics learning competencies before the school year ended. The study employed the experimental research design, and three groups were randomly selected from the seventh-grade population as respondents. These three groups underwent pre-test and post-test before and after the intervention. Then, an expert panel of evaluators reviewed and quality assured the 50-item multiple-choice test questionnaires using the conducted pilot testing and the generated Cronbach alpha index. The study's findings revealed that learners' test scores differed significantly among the three groups based on one-way ANOVA. However, the Tukey post hoc test showed that the Flipped Online group differed substantially from the Flipped Shareable and Offline groups. Consequently, Project OSO was considered a valuable resource in the Flipped Classroom and highly recommended for instructing learners when the teacher was out due to school-related functions among the three video lectures platforms.

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