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This research is a type of Research and Develpment (R&D) that aims to determine the validity and response og teachers to the assessment instruments developed. The deveopment model is adapted from the 4D model by implementing the define,design, and develop. This research instrument includes instruments of material validity, language, construction, and teacher response questionnairs. the subject oh this research is MTsN 2 sumenep. The from of the produk developed was analyzed using quantitative and qualitative data analysis. the validation resut of the product vaidity assessment. Obtained data on material aspects get good categories (71%), contruct aspects get good categories (65%), language aspects get good categories (77%). The results of the teachers response to the assessments instrument developed are good and usable. This can be seen from the results of the display aspect getting a ggod category (80%), the linguistic aspect getting a good category (80%), and the assessment standards based on the K-13 curricuum get a good category (80%).

VALIDITAS INSTRUMEN PENILAIAN KEMAMPUAN BERPIKIR KRITIS MELALUI MODEL PROBLEM BASED LEARNING MENUJU PEMBELAJARAN IPA ABAD KE 21