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The purpose of this study was to analysis of mastery of concepts and students argumentative abilities improved with argument-based science inquiry (ABSI) models. The method used was Descriptive Research. The instruments of data collection used in this study were observation, teachers structured questions, interview. This study was conducted in junior high schools plus An Naba Sukabumi with 25 seven-grade students. Based on the results of the analysis of teacher answers from structured questions, information was obtained that students argumentation skills were still low and one of the ways to improve student argumentation was experiment. One learning model that can be applied to improve students argumentation and mastery skills is argument-based science inquiry (ABSI). The application of ABSI in enhancing the argumentation skills is in the research stage.