<![CDATA[The Aptitude Treatment Interaction (ATI) is a model that has a number of learning strategies developing effective learning condition for students according to their individual ability. This research is quasi experiment that aims to determine the effectiveness of ATI learning model considered of student’s mathematical conceptual understanding. Design used in this study was a pretest postest control design. The population of this research is students of SMP 29 Bandar Lampung at seventh grade in second semester of 2012/2013 academic years that having low mathematical conceptual understanding which consists of nine groups, while the sample of the research is taken by using Purposive Random Sampling technique. Based on the result of hipotesis test, the increasing average of student’s mathematical conceptual understanding by using ATI learning model is more than that of using conventional learning in the significant level 5%. So, it was concluded that the ATI learning model is effective considered of mathematical conceptual understanding of student.Keywords: Aptitude Treatment Interaction (ATI) learning model and mathematical conceptual understanding.]]>
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