Abstract
This research aims to develop a scientific performance assessment instrument in the laboratory in experiment of analyzing the content of a compound in loose powder. The assessment instrument developed is in the form of worksheets and performance assessment sheets and rubrics. The method used in this research is design-based research (DBR) with two stages, namely the analysis stage and product design development. Data collection was carried out by validation tests to expert lecturers and the results were analyzed. The results of the validation test of scientific performance assessment instruments in the form of worksheets obtained a value of rcount = 0.83 and performance assessment sheets rcount = 0.84. This value indicates that both instruments are valid.
 Keywords: development, assessment instruments, science performance
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