teacher was in the class and told that. It was suitable with the theory stated by Joshi 1995 that the using of visual aid could increase the effectiveness of
classroom teaching and learning process. But this method had weakness too, it was rather difficult to visualize the verb in picture.
2.7 Theoretical Assumption
There are three components of language, namely phonology, grammar, and
vocabulary. Vocabulary is one important part in learning a language, because without vocabulary it can be so difficult to communicate with each other. Students
who do not master a sufficient number of vocabularies are going to fail in using language satisfactorily either in oral or written form. It means that the ability to
use English in daily life needs the mastery of adequate vocabulary. In this research, the researcher focused on teaching vocabulary by using method
that was called words categorization method. The researcher assumed that the representative of words categorization method in the class had some advantages.
Besides, it can be more easily handled in the class and represent real thing, because the media that was used is clipping picture puzzle. Picture could also help
the students to get the correct word. Therefore, it was easy to study vocabulary and improve the students’ achievement of vocabulary.
2.8 Hypothesis
Based on the frame of thinking above, the writer formulates the hypothesis as
follows: There is a significant improvement of students’ vocabulary achievement
after being taught by using word categorization method.
III. RESEARCH METHOD
This research was quantitative research. And in conducting the research, the researcher used quasi experimental method. This experimental method dealt with
only one group, the experimental class. The data that was obtained was number score that were assessed and analyzed by using statistical analysis.
3.1 Research Design
In conducting the research, the researcher used quasi experimental method. This experimental method dealt with only one group, the experimental class. The
experimental class was the class which got treatments through Words Categorization Method that was presented by the researcher. The class received
pre test, treatments which were done three times, and post test. The result of pre test and post test was compared to know the significant.
The design was presented as follows: G:
T1 X
T2 G : Experimental class
T1 : Pre-test T2 : Post-test
X : Treatment Setiyadi, 2006:132
