IMPROVING ENGLISH WRITING SKILL THROUGH STUDENT TEAMS-ACHIEVEMENT DIVISION (STAD) IN FIFTH GRADE OF ELEMENTARY SCHOOL STUDENTS (Experimental Research at the Fifth Grade Students of SD Lab School Unnes Semarang in the Academic Year of 2013/2014)

The study is to show the effectiveness of Student Teams-Achievement Divisions (STAD) in improving English writing skills for the fifth grade students of SD Lab School Unnes Semarang. The researcher treated them in teamwork. The research design is quasi experimental research. The researcher found that the data were not normally distributed, but homogeny, so she analyzed them by using Mann Whitney statistics. They got very different average scores. The average scores of the experimental class are 64.20 in pretest, 70.00 in post test and 5.80 in gain score. The control class is 64.08 in pretest, 66.00 in protest and 1.92 in gain score. The score increase of practical writing experimental class (5.80) is higher than the control class (1.92). The tests were supported by the questionnaire that 64% students were very interested in STAD. It proved that the STAD results of teaching writing are more effective and different from the traditional way