worry about the mechanics of writing the students had. They have learned much about the mechanics of writing both from Indonesian language course or English
course. The language style used by the students was rather poor. They wanted to express their feeling through their writing. However they did not know how to
express it with English. Their language style was still influenced by their mother tongue.
4.1.3.2. The Analysis of Students’ Writing Skill in Posttest
After delivering the pretest, the next process was giving the treatment. To know if there is difference between each group, posttest was delivered to the students in the
end of the study. Same as the assessment of the pretest, the assessment of writing posttest used Brown and Bai
ley’s scoring rubric. From the data, the writer could find the mean of each group. There was improvement for each group. However,
the improvement was different for both two groups. The experimental group seemed higher improved than the control group. Thus, the writer analyzed the five
aspects of scoring for the experimental group. The experimental group had improved their organisation of the text,
that was from 15.5 in the pretest and it became 17.5 in the posttest. Their content had related to the organisation. It was clear where they put the opening, body, and
ending of the essay. There was no excessive sentence. The students were able to manage their ideas into a good writing. If in the pretest the students were confused
to start and finish their writing, in the posttest they could more focus on their topic and start to write down their words easily. The third aspect was grammar. In the
pretest, the students made many errors because they were not really concerned
about the English grammar. This was caused by their habit to write down their essay in Indonesian language and then they translated it in English. Besides
wasting their time, this can cause the error translation. The students did not know the right procees instead they translated their work word by word without learning
the context of the sentence. In the posttest, their grammar showed an improvement. Because they did not translate their work from Indonesian language, they were
more concerned about English grammar. Thus, the essays from the students in the posttest also showed improvement in grammar. The mechanics and the style of
their writing also became better than their writing in the pretest. The students now understand how to use dictionary correctly. They also have known some words
and the differences of these words in the sentence. If in the pretest the writer met many errors in spelling, in the posttest there were less errors existed in the
students’ work. The verbs they used were correct. For the style and expression aspects, the students seemed to be brave to use some new vocabularies.
Fortunately the usage of new vocabularies were still suitable to the context of the sentences. The style of their writing language still a little bit sounded like
Indonesian language style. However, there was difference from the pretest. There was an improvement. If in the pretest the students’ sentence still contained
Indonesian- English style, in the posttest the students’ sentence more sounded like
English sentence. Although, there were some sentences were still strange, but the readers still could get the meaning without any difficult distraction.
4.2
Discussion
The previous sub-chapter analyzed about the students’ writing skill in the pretest
and posttest. In this sub-chapter, the writer discusses the research finding to know whether teaching writing using tree diagram is effective or not and how the use of
tree diagram technique for the eleventh grade students of SMA N 2 Bae-Kudus in academic year 20102011 is.
The use of tree diagram technique as a means of teaching writing started by firstly giving a piece of paper to the students to make their own tree
diagram. In the paper there was an outline of tree diagram. The students wrote down their ideas started from the upper single node as their topic or title, then they
wrote the other related ideas in the branches. From the observation, the writer could see that the students could make their tree diagram correctly. At first, the
students felt awkward about the form of the tree diagram. They did not know what they should write on the single node and the branches. However, after they got the
example of how to use the tree diagram, they started to write down their ideas. As far as the writer’s observation, the use of tree diagram technique as a means of
teaching writing for the students ran well. In this study, the writer wanted to know the contribution of tree
diagram technique to improve the students’ writing ability in essay. When the
study was being conducted, in her observation the writer found that the students were more enthusiastic. It was caused by some reasons. First, with the tree
diagram technique, the students felt more free to express their ideas. Many students had unpredictable ideas, but they did not know how to manage them.
Usually when some students had a writing task with certain topic, they did not know what they were going to write for their essay. In short, they had no idea.
Tree diagram can help the students to start their writing process. In tree diagram, the starting point is the root or central idea. With this central idea, the students can
easily continue their ideas in the next branches or points. The students also can broaden their ideas or limit their words.
Before the students know about tree diagram, they usually did their writing in Indonesian language and then translated it. This way is not effective.
The second reason why tree diagram can help students in writing beacuse it is more effective. The use of tree diagram enables students to gain more information
about the certain topic given. The students will not loss the information that is needed for their essay. Some of the students gave testimonial that they chose tree
diagram than their usual way in writing because with tree diagram they could gain the detail information for their essay. When the students use tree diagram
technique, they can enjoy their writing because it is not monotonous way to make an essay.
The result of the data analysis based on the scoring of the students’
works is the use of tree diagram makes an improvement in the students’ ability of
writing. Based on this study, the writer can say that the tree diagram can be an appropriate technique to be applied in writing genre or essay. Tree diagram also
seemed to be applicable for the eleventh grade students in SMA N 2 Bae. This technique can help the students to organize their ideas and gained more
information about the topic that the students are going to write.
Similar with other techniques of teaching, tree diagram has advantage and disadvantage. The advantage of tree diagram is it effectively help the students
to organize their ideas before writing. This activity is very crucial because in prewriting activity, the ideas that the students have have to be organized and
developed to be a good essay. With tree diagram, the students also can use their time more efficiently than they use Indonesian language draft before writing. The
disadvantage of tree diagram is this technique sometimes needs more space in their book or note. Some students also usually felt difficult to limit their ideas
because they more focused on their ideas and topic.
CHAPTER V CONCLUSION AND SUGGESTION
