Development of a Micro lesson using an Inquiry-Based LAS in a Flipped Classroom Setting for the Aral Program in Science 10

This study examined the validity, effectiveness, and learner perceptions of a microlesson using inquiry-based Learning Activity Sheets (LAS) in a flipped classroom setting focused on natural selection. Expert validation showed that the lesson plan obtained high mean validity ratings, indicating strengths in structure, clarity, real-life application, and promotion of higher-order thinking. However, content validity analysis revealed insufficient expert consensus, with all Content Validity Index (CVI) values below acceptable thresholds, highlighting the need for substantial revisions in SMART objective formulation, learner engagement, assessment alignment, cultural relevance, and instructional clarity, despite the instrument’s high reliability and consistent expert ratings. In contrast, the Learning Activity Sheet demonstrated excellent content validity, achieving unanimous expert agreement, perfect I-CVI and S-CVI/Ave values (1.00), and 100% inter-rater agreement, confirming its suitability for instructional use.