Rosetta Stone CALL Software as A Vocabulary Teaching Media at Indonesian High Schools

Vocabulary is the basic aspect of language. The ability to master vocabulary holds an important part in learning a language, including English. That becomes one of the researcher's considerations to conduct this research when observing at one of Indonesia's high schools since the students show difficulties in vocabulary mastery. Modifying the teaching media can become a problem solving for students' lack of vocabulary mastery. In this case, using Rosetta Stone CALL software is suggested to overcome the problem. The research's objective was to determine whether or not the use of Rosetta Stone CALL software can improve the tenth-grade students' vocabulary mastery. The researcher applied a quasi-experimental method, with two group pre-test and post-test design. The research sample was forty students from two classes taken from the population of the 10th-grade students of SMA Negeri 2 Barru. The data analysis result showed that the pre-test's mean score in the experimental class was 2.21, and the post-test was 3.04. It proves that the tenth-grade students' vocabulary mastery improved using Rosetta Stone CALL Software. After analyzing the data using SPSS version 21, the probability value in the post-test was 0.01, and the significance value was 0.05. It means that the probability value (0.01) was lower than the significance value (0.05). It was indicated that H0 was rejected and H1 was accepted. It revealed that the vocabulary mastery of the tenth-grade students of SMA Negeri 2 Barru for the experimental and control groups was significantly different.