3.2 Area Determination Method
The area determination of this research was conducted by using purposive method. According to Arikunto 1996:127, purposive method is a method used
based on certain purposes and reasons. It means that, in purposive method, the researcher must be sure that the population chosen is suitable with hisher purposes of
the research conducted. This classroom action research was conducted at SMP Muhammadiyah 6 Wuluhan. This school was determined purposively as the research
area for some reasons, i.e.: 1 the researcher found the problem at this school, 2 Numbered Heads Together NHT learning had never been used in teaching English,
especially for teaching writing, 3 it gave benefits for the students and the teachers at this school because this research gave an input to improve the teaching learning
process, 4 the school provided the data and the facilities needed for this research, 5 the researcher had known the condition of the teaching learning process, and the
characteristics of the grade VIII students in each class since she has become a new teacher there. Therefore, the researcher has an easy access to conduct the research at
this school.
3.3 Subject Determination Method
The subjects of the research were chosen by purposive sampling in which the sampling is chosen based on certain purpose and reasons Arikunto, 1996. The
subjects of this research were the eighth year students of SMP Muhammadiyah 6 Wuluhan in the 20092010 academic year. There were two parallel classes which
consist of 37 students in grade VIII-A and 36 in grade VIII-B. From the two classes, the researcher took one problematic class purposively that was based on the
researcher’s observation in her class.
The researcher chose one of those classes purposively to be the subject of the research that is VIIIB based on some reasons. First, the mean score of class VIIIB
was the lowest of all. The mean score for writing in grade VIII-A was 64. In contrast, the mean score in grade VIII-B was 58.08. Second, the students in grade VIII-B were
passive in giving response during the lesson. Third, the level of intelligence of the students in this class was heterogeneous. It means that in grade VIIIB 20 of the
students are high achiever, 35 of the students are low achiever, and 45 of the students are average achiever. Fourth, they were passive in learning. They just got the
English lesson based on their workbook that is Formula.
3.4 Data Collection Method
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