Junior High School Students' Reasoning

This research aims toidentify at the argument of students reasoning between the group trained with reasoning and withouttraining. The method used was quasi-experiment. With the sampling technique by the cluster random sampling. Total sample of 33 students in experimental group and 33 students control group were chosen by random cluster sampling. The reasoning item test was used as an instrument which isassociated by the biological concepts. The reasoning item test is wasmodifiedbased on Toulmin Argumentation Patterns (TAP) which consisted of claim, data, warrant, backing, qualifier, rebuttal. The results showed the completeness argumentation component of students who got trained at level 1 (0.51%), level 2 (78.79%), level 3 (16.67%), level 4 (3.03%). While the students without reasoning training at level 1 (4.55%), level 2 (93.43%), level 3 (2.53%), level 3 (3.03%).