Abstract
This research aims to get analyzation of reasoning skill in Senior High School level. Defined as ability in drawing conclusion expressed in logical argument, the analyzation on reasoning skill is measured by student argument in answering essay question involving respiratory system topic. The arguments are categorized into five levels based on Toulmin Argumentation Pattern (TAP) consists of Claim, Data, Warrant, Qualifier, Backing, and Rebuttals. The subjects are students of Senior High School chosen by purposive sampling. The method used in this research is descriptive. The results shows that level of students argumentation lies 29.17% on level one and 70.83% on level two This results indicates that most of Senior high school students are having difficulty in giving explanation on their claim using the data related to fact or theory they have acknowledged.
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