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Anchored in the ADDIE model, the research employed a descriptive developmental design involving expert validation using DepEd’s LRMDS tool anda CAI integration rubric, alongside a pilot test with 45 students. Quantitative data were analyzed using descriptive statistics, paired sample t-tests, and Cohen’s d, while qualitative feedback was thematically analyzed. Findings showed that the lessons were rated “Very Much Evident” in CAI features (M = 4.80) and “Very Satisfactory” in quality by experts. Students likewise reported high levels of engagement, clarity, and usability. Posttest results demonstrated significant gains across all four ecosystem topics, with effect sizes ranging from 1.80 to 3.43 and an overall gain from Low Mastery (48.3%) to Near Full Mastery (86.0%) . The validated lessons not only promoted scientific understanding but also fostered peer collaboration, critical thinking, and ecological awareness through contextualized, student-centered learning experiences. This study presents an empirically grounded instructional model that addresses enduring challenges in Philippine science education by integrating social learning and inquiry processes into the delivery of environmental content. It offers a scalable, curriculum-aligned approach for transforming conventional science classrooms into participatory communities of inquiry.  \nRESUME  \nEste estudio desarrolló y validó un conjunto de lecciones de ciencias para estudiantes de séptimo grado sobre temas de ecosistemas, integrando estrategias de aprendizaje Colaborativo, Activo y Basado en la Indagación (CAI) con el fin de mejorar la comprensión conceptual, la participación y la alfabetizaciónambiental de los estudiantes. Basado en el modelo ADDIE, la investigación empleó un diseño descriptivodesarrollativo que incluyó la validación por expertos mediante la herramienta LRMDS del Departamento de Educación y una rúbrica de integración CAI, junto con una prueba piloto con 45 estudiantes. Los datos cuantitativos se analizaron mediante estadísticas descriptivas, pruebas t para muestras relacionadas y elestadístico d de Cohen, mientras que los comentarios cualitativos se examinaron mediante análisistemático. Los resultados mostraron que las lecciones fueron calificadas como “Muy Evidentes” en cuantoa las características CAI (M = 4.80) y como de calidad “Muy Satisfactoria” por parte de los expertos. Los estudiantes también reportaron altos niveles de participación, claridad y facilidad de uso. Los resultados del postest mostraron mejoras significativas en los cuatro temas de ecosistemas, con tamaños del efectoque oscilaron entre 1.80 y 3.43, y un aumento general desde un dominio bajo (48.3%) hasta un dominiocasi completo (86.0%) . Las lecciones validadas no solo promovieron la comprensión científica, sino que también fomentaron la colaboración entre pares, el pensamiento crítico y la conciencia ecológica a través de experiencias de aprendizaje contextualizadas y centradas en el estudiante. Este estudio presenta un modelo instruccional empíricamente fundamentado que aborda desafíos persistentes en la educacióncientífica filipina al integrar el aprendizaje social y los procesos de indagación en la enseñanza de contenidos ambientales. Ofrece un enfoque escalable y alineado al currículo para tra","cbCaim3eZDU3iPjl","https://ap.wps.com/l/cbCaim3eZDU3iPjl","pdf",517137,"English","# Introduction\n## Background and learning gaps\n## Teacher-centered instruction and its limitations\n## Study approach and validation","[{\"question\":\"What was the focus of the developed Grade 7 science lessons?\",\"answer\":\"The study developed and validated Grade 7 science lessons centered on ecosystem topics, aiming to improve students’ conceptual understanding, engagement, and environmental literacy.\"},{\"question\":\"How were the lessons designed and validated?\",\"answer\":\"The lessons were anchored in the ADDIE model and used a descriptive developmental design with expert validation through DepEd’s LRMDS tool and a CAI integration rubric, supported by a pilot test with 45 students.\"},{\"question\":\"What results did the posttests show?\",\"answer\":\"Posttest results showed significant gains across all four ecosystem topics, with effect sizes ranging from 1.80 to 3.43 and an overall mastery improvement from 48.3% (Low Mastery) to 86.0% (Near Full Mastery).\"}]","Development and Validation of Ecosystem Lessons Integrating Collaborative, Active, and Inquiry-Based (CAI) Learning Approaches for Grade 7 Science in the Philippine Context | PDF",1790047081]