Abstract
This study investigated the effectiveness of a developed Skill Book on the reading performance of Grade 6 learners at Sto. Domingo Elementary School, Bula North District, Division of Camarines Sur, school year 2023–2024. It specifically examined learners’ pretest and post-test performance in comprehensive evaluation assessment skills and reading comprehension, the design and curricular validity of the Skill Book, and the extent of its effect on learners’ reading outcomes. Employing a descriptive-comparative and research and development (R&D) design, the study utilized a teacher-made test, documentary analysis, and a validity evaluation checklist. The sample consisted of 28 learners. Data were analyzed using mean, standard deviation, proficiency levels, t-test, and Cohen’s d. Findings revealed a significant improvement in post-test scores across reading domains. Pretest results indicated that 53.57% of learners were at the established level, with 21.43% categorized as deficit. In contrast, post-test data showed 82.14% of learners at the established level, with none in the deficit category. The Skill Book, which integrates phonemic awareness, phonics, fluency, and vocabulary, was validated as highly curricular-valid (M = 3.86). Statistical tests showed significant differences between pretest and post-test scores in key reading components, with very strong effect sizes: phonemic awareness (r² = 0.97), phonics (r² = 0.98), fluency (r² = 0.95), and vocabulary (r² = 0.99). Results confirm the Skill Book’s effectiveness in enhancing learners' reading performance and support its use as an instructional intervention in reading instruction.