| Summary: | The purpose of this research was produce a performance science practicum assessment instruments based science process skill which is valid, reliable, practical, and effective for measuring the skill of science process in junior high school. The type of this research is development research designed with the assessment development model from Doran et al., 1998. The average result of the instrument validation test is 3.50 and can be categorized very valid and can be applied in the learning after going through several revisions. Reliability test results show that reliable instrument with reliability coefficient of 0.78. The average result of the instrument practicality test is 3.38 and it is practically categorized and can be applied in the learning after going through several revisions. From the average student score can be stated all students get the value above the minimal mastery criteria, with students the average score is 83.98 and from the t-test results obtained t count 30.376. Based on these findings, it can be concluded that the instrument assessment of science practicum performance based on science process skills can be used to measure students' science process skills, easy to use in learning, and effectively used in science learning activities.
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