<![CDATA[This research and development (R&D) study aimed to develop, validate, and test the effectiveness of Outcome-Based Education (OBE) based reading comprehension materials for eleventh-grade students. Recognizing that reading comprehension is a critical yet challenging skill, this study addressed the need for more creative and effective teaching methods. OBE, which focuses on organizing the educational system around essential outcomes students must achieve, was employed as the foundational framework. The study followed the Borg & Gall R&D cycle. The population was students of SMK AL WASHLIYAH 12 SEI RAMPAH, with a sample of 15 students from class XI-1 selected as the experimental group. Data were collected through literacy studies, interviews, observations, group discussions, and documentation. Material validation was analyzed using descriptive quantitative techniques, resulting in an average validity score of 4.1, indicating a "good" level of quality. The effectiveness of the developed materials was determined using the N-gain score. The results demonstrated a significant improvement, with an average increase of 9.13% in learning outcomes and a classical passing rate of 86.66%. The N-gain score of 81.94% further confirms the high effectiveness of the OBE-based materials. It was concluded that the developed reading comprehension materials are both valid and effective, making them a viable tool for enhancing English reading instruction and achieving defined learning outcomes.]]>
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