Improving English Vocabulary Mastery Of Grade VIII Students Through Student Team Achievement Division (Stad) Method

The objective of this research is to find out whether the application of STAD method can improve the English vocabulary mastery of grade VIII students of SMP Negeri 19 Palu. This research applied quasi experimental research design in which the two groups had posttest. The population was Grade VIII students of SMP Negeri 19 Palu. Thesamples were Class VIII D as the experimental group and VIII A as the control group which contained 17 students for each. Experimental group was given the treatment, while the control group was not. The technique of data collection was test. The data were analyzed descriptively and statistically. Having analyzed the data, the researcher found that there were different score obtained from the control group and the experimental group. In other words, the t-counted (6.6) was greater than the t-table (2.0). In this case, the research hypothesis was accepted. Hence, the use of students team achievement division method can improve the students vocabulary mastery of the grade VIII students of SMP Negeri 19 Palu. Keywords: Improving, Vocabulary, Students Team Achievement Divisio