Subject of the Research

2. Preparing the try-out test and conducting it The try out test was administered at the first meeting. The researcher used objective vocabulary test in form of multiple choice test that consisted of 50 multiple choice items in 90 minutes. 20 items of 50 items provided was eliminated based on the result of the try-out-test by considering its difficulty index and its discrimination power. Those multiple choice items was analyzed and revised to find out the good items to be used in pre test and post test. When the items had been analyzed whether it was good or not for the pre test and post test, it was divided into three parts for three pre tests and post tests. The aim of try out test was to find out the quality of the items of the test used in the research, such as, validity, reliability, level of difficulty, and discrimination power of the test. 3. Selecting the Materials The researcher chose the appropriate materials based on the syllabus. There was three meetings by using different materials related to vocabulary comprehension. 4. Conducting Pre-test The pre test was administered in order to measure the students’ mastery of vocabulary before being taught through clustering technique. The pre test was in form of multiple choices with 30 items. The questions and the answers of this test were the same as the try out test. In addition, it was administered for 50 minutes in the experimental class. So that, the researcher was able to compare the result with the post test result later. 5. Treatment In this research, the treatment was done in three meetings with 90 minutes in every meeting. The chosen class was taught by using clustering technique. The procedure of implementation of clustering technique in teaching vocabulary predicate as follows: Pre Activities While Activities Post Activities 6. Administering Post-test Post-test was conducted after the treatment. Post-test was administered in order to know the progress of vocabulary skill after using clustering technique. Based on the design of this research that is one way repeated measures anova, post-test was conducted in three times, after each meeting or after each treatment. The post test was administered to the experimental class. The result of the test was compared with the pre test to find out whether there was different score or increase from the pre test and the post test result. It was in objective test in form of multiple choices that consists of 30 items. The questions and the answers of this test were same with the try out test. The post test was administered in 50 minutes.