<![CDATA[The purpose of this research to analyze the consistency and effectiveness of students' conceptual understanding.This research is a descriptive study using a qualitative approach. The subjects of this research are students of class X MIA who have studied the material of particle dynamics 42 people. The instrument used was a test of understanding the concept of particle dynamics in the form of a reasoned multiple choice test of 23 numbers and a questionnaire on the effectiveness of students' understanding of concepts. The results of data analysis show that students who have good concept understanding skills have a level of consistency and effectiveness in answering questions. Because the questions are answered in detail and systematically. Students with sufficient conceptual understanding skills have a low level of effectiveness and the answers to questions are not answered in detail, not systematically. This is marked by the scribbles of each answer, understanding the problem]]>
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