<![CDATA[Arguing ability was a part of critical thinking skills which important to be mastered by the students. In fact, students’ ability to argue was still relatively low. This referred to the TIMSS report (The Trends in International Mathematics and Science Study) in 2011, and showed that Indonesian children’s level in science was positioned in 42 from 45 countries. One kind of efforts to improve the quality of the ability to argue was applying the model of guided inquiry. This study was aimed to develop inquiry-based learning tools (PPBIT) and analyzed its effectiveness in developing the ability to argue of students at SMAN 2 Taliwang-West Sumbawa. PPBIT was carried out by applying 4D procedure. Then, pretest posttest control group design also completely concerned in determining the effectiveness of PPBIT. There were 66 students as the sample which was scattered from two classes and was selected by using purposive sampling technique. The results showed that PPBIT was appropriately to be used for students argumentation skills’ activities by an average of feasibility syllabus 78.71%, RPP 83.5, LKITS 75%, and Instruments KB 80.25%, and effective in improving the ability to argue the class X SMAN 2 Taliwang, particularly on the subject of environmental pollution and recycling of waste by the average score of the students' ability from 48.22 up to 85.08Keyword: PPBIT, Argument]]>
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