This paper is based on the interest of knowing more about cooperative learning and the possible impact it has on primary students' education. Using cooperative learning as a method in school is mostly to involve the students more in their learning process. Through discussions and other structures students have a chance to express themselves and every student can participate in the activity. Our purpose for doing this study is to bring forward the positive aspects of using cooperative learning but also the challenges. Our research questions are: 1. How is cooperative learning used? 2. How do teachers describe cooperative learning and the contribution to students´ language development? Our paper is based on the sociocultural theory which cooperative learning has evolved from. It is important for pupils to use talking skills in school. The methods we used to collect data was through interviews and observations. We interviewed six different active teachers and observed four of them. The material we used to record the interview was a dictaphone. One of us asked the questions and the other made notes by writing down some keywords in case there was something wrong with the recording. The results show us cooperative learning may make the classroom environment a bit noisy. However, this still works since the method has more benefits than challenges. In conclusion, the interviews and the observations reveal the result of how cooperative learning contributes to students' learning by benefiting the students.