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The purpose of this study was to produce a reasoned multiple choice test instrument that was used to measure students critical thinking skills. This research is a development research by adapting the 4-D model according to Thiagarajan which consists of the define, design, develop, and disseminate stages which aim to produce the product. The product developed in this study is a critical thinking ability test instrument on rain theme science subjects. Based on the results of the study, obtained a reasonable, valid and reliable reasoned multiple choice test instrument used to measure students critical thinking skills. The products produced from this study are form of reasoned multiple choice questions accompanied by answer keys and scoring guidelines.