This research was conducted to find out the effectiveness of Four-Square
writing method to improve students’ writing skill of descriptive texts. The subject
of this research was 68 students of eighth graders of SMP Negeri 1 Patikraja,
chosen randomly. There were two classes as research participants, namely class
VIII D as experimental group and VIII E as control group. The data were
collected by using essay test. The result of the study showed that after the
treatment, there was difference in the students’ achievement in writing descriptive
texts between students taught using Four-Square method and those without Four-
Square method. Having the analyzed the data, the writer found that the students’
achievement in experimental group was better than that of the control group. It
could be seen from the result of t-test calculation, which was 4.56 while t-table
value at the level of significance α = 0.05 for degree of freedom (df) = 66 was
1.668. It means that t-test was higher than t-table (4.56 > 1.669). Therefore, it
could be concluded that Four-Square writing method was effective to be used to
teach descriptive texts.