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Scientific reasoning is the ability to think formal developmental traits to master concepts and solve physics problems. Physics problem solving requires a high level of thinking that is a combination of reasoning that is conceptual and general mathematical equations. The student’s thinking ability that is inconsistent with their formal developmental stage is the cause of the student’s lack of scientific reasoning. The purpose of this study is to analyze common false by students during the scientific reasoning process. Scientific reasoning tests were given to 108 students who had studied physics using mixed methods of lectures and assignments. The analysis results show description of errors of each component of students' scientific reasoning. Student's scientific reasoning is dominated by competent level. The quality of claims, arguments and levels of student confidence in the answers are still low. Students experience errors of scientific reasoning and weak concepts when confronted with physics problems. The important recommendation of this study is that learning needs innovation to overcome errors and confidence in the process of scientific reasoning and mastery of student concepts.

Formal Development, Learning Physics, Scientific Reasoning, Three Tier Test