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Science process skills cannot be separated from conceptual learning. To measure science process skills possessed by students, assessment instruments are needed that are easy to use and appropriate. This study aims to measure the science process skills of high school students using the Testlet assessment instrument. Indicators The science process skills used are observing, hypothesizing, planning experiments or investigations, analyzing experimental data, applying concepts or principles, and communicating. This assessment instrument Testlet consists of 6 stem and 3 supporting questions for each stem, questions in the form of multiple choices and given to 36 grade XI students at Madiun 4 High School. The results of this study indicate the Science Process Skills of students at SMA 4 Madiun in static fluid material included in the medium category with an average value of 63.51%.