Background of this study is an effort to know which technique is suitable to use in teaching Pronunciation. Indonesian students who have learned English for several years are still cannot communicate using English. So the researcher thought that there should be a solution to cope with that problem. The researcher tried to use Performing Drama as a technique to improve students’ Pronunciation of Affix "S" Added to Sibilant Sounds in the Simple Present Tense.

This study is about the use of Performing Drama as technique/method to improve student’s Pronunciation of Affix "S" Added to Sibilant Sounds in the Simple Present Tense of the seventh grade students of SMPN 23 Semarang in the 2010/2011 academic year. The statement of the problem in this study is; is Performing Drama effective for the seventh grade students of SMPN 23 Semarang to improve Student's Pronunciation of Affix "S" Added to Sibilant Sounds in the Simple Present Tense? The objective of the study is to find out whether or not Performing Drama is effective for the seventh grade students’ of SMPN 23 Semarang in 2010/2011 academic year to improve Student's Pronunciation of Affix "S" Added to Sibilant Sounds in the Simple Present Tense.

The population of the research was the seventh grade students of SMPN 23 Semarang. The research methodology was an experimental research, which conducted in two classes; the experimental group (VII B) and control group (VII A) as sample. The VII B was taught by Performing Drama, while the VII A was taught without Performing Drama (Direct Method). The writer gave Performance test to gather the data. The test without tried out test because the test had been valid. The formula that was used to analyze the data was t-test. It was used to determine whether or not there was a significance difference between students’ score in experimental group and students’ score in control group.

After the data had been collected by using test, it was found that t-test was (1.754), whereas the t-table was (1.67) for a = 5%. The t-test score was higher than the t-table (1.754 > 1.67). It was meant that Ha was accepted while Ho was rejected. Since t-test score was higher than the t-table, Performing Drama was effective technique/method in improving students’ pronunciation in SMPN 23 Semarang.