This study aims to investigate and comprehensively describe the profile of Science Process Skills (SPS) among grade XII students in the biology material on Inheritance of Traits at SMA Negeri 1 Ngawen. The study uses a quantitative approach, employing the Research and Development (R&D) method and adapting the ADDIE development model. Quantitative data collection was carried out through tests using SPS assessment instruments in the form of structured essay questions that include 6 main indicators: observing, classifying, predicting, measuring and using numbers, concluding, and communicating. The results of data analysis show a very uneven distribution of students' SPS abilities: only 1.47% of students are included in the "good" category, 19.12% are categorized as "sufficient", 20.59% are categorized as "less", and the absolute majority of 58.82% are in the "very less" category. Cumulatively, the average student KPS score was 41.67% (very poor). This finding underscores the need for a radical reconstruction of biology learning strategies by shifting toward a scientific approach integrated with the STEAM framework to boost students' scientific investigation skills.
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