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The study was aimed to determine; (1) how is the design of the development of the Brain-Based learning model that can improve the students' critical thinking skills at elementary school, (2) what is the feasibility of the Brain-Based Learning model can increase the students' critical thinking skills at elementary school, (3) how is the effectiveness of using the Brain-Based learning model can develop the students' critical thinking skills at elementary school. The research was R&D adopted from Borg & Gall model. Model validation was expert judgment. Model testing was using a quasi-experiment through pretest and posttest. The trial conducted for class V for two elementary schools in the Curup area. The data were obtained through observation and questionnaires. The data analysis was carried out through the average score and per cent. From this development research, a model design was generated Brain-Based learning to improve critical thinking skills namely, preliminary activities, core activities and final activities. Meanwhile, based on the results of the trial model, it showed that (1) the Brain-Based Learning model met the feasible criteria as indicated by the expert and practitioner's assessment with the mean of 3.63 and 3.43, with a good category. (2) the effective of Brain-Based Learning fulfils criteria indicated by the average result of student activity in learning 34.00 with a good category. The positive response to the implementation of learning obtained a mean of 4.33 with a happy/agreeable criterion. The students' achievement learning competence from the two classes trial with mean scores was 76.33.
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