This research discusses the effectiveness of numbered heads together technique supported by picture in teaching writing descriptive text (an experimental research at eight grade of SMP Futuhiyyah Mranggen in the academic year of 2015/2016). This research was aimed to find the answer to the following research questions: Is numbered heads together technique supported by picture effective in teaching writing descriptive text at eight grade of SMP Futuhiyyah Mranggen in the academic year of 2015/2016?. The background of the research was the eight grade students of SMP Futuhiyyah Mranggen have the problem to understand their English learning especially in writing, most of them make errors in both organization of ideas and language in use. Their comprehension could be recognized through their way of writing.
The population of the research was the eight grade students of SMP Futuhiyyah Mranggen in the academic year of 2015/2016. The research method was an experimental research, which conducted in two classes; the experimental group (VIII B) and control group (VIII C) as the sample. The VIII B was taught by using numbered heads together technique supported by picture, while the VIII C was taught with conventional teaching. The formula that was used to analyze the data was t-test. It was used to determine whether there was significant difference between students’ score in experimental and control group or not.
The result of the data was found that the pre-score average in experimental group was 65.52 and control group was 63.38. Meanwhile, the post-test average score of experimental group was 76.02 and control group was 64.46 . It was obtained that t-test was 8.55 and the t-table was 1.670 for alpha (α) 5%, the t-test was higher than t-table (8.55>1.670). It meant that Ha was accepted and Ho was rejected. Based on the result, it was concluded that numbered heads together technique supported by picture as a teaching strategy was effective in teaching writing descriptive text at SMP Futuhiyyah Mranggen in the academic year of 2015/2016.