Abstract
In this study, the author had used Team-Assisted Individualization (TAI). It was as an alternative Cooperative Learning to enhance students' mathematical reasoning ability. The population was the tenth grade students of SMA Negeri 1 Parongpong West-Java, and the sample was two classes of grade X students. Design research was a randomized pretest-posttest control group design. The instrument was used in this study consisted of written tests in the form of description to measure mathematical reasoning. Normality test, homogeneity test and test the difference of two averages were used in analyzing data. Based on this research, it was known that 1) the enhancement of students’ mathematical reasoning who obtain TAI type of cooperative learning was in medium category, 2) the enhancement of students’ mathematical reasoning who obtain TAI type of cooperative learning was better than the students who obtain conventional learning.
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