In Sweden and in many places around the world there is a great discussion about using L1 or not in teaching. The fact that 43% of the pupils having a parent speaking another language do not qualify for upper secondary studies in Sweden is worrying. The aim of the thesis was to collect a classroom teacher's experiences and how the teacher perceived the pupils' participation and the perspectives of the mother tongue teacher over three lessons. The research was carried out in a multilingual grade 3, consisting of 19 pupils. The focus was the experience of the classroom teacher and mother tongue teachers. The result was positive for pupils in many ways but the organisation of how to use L1 is an issue to solve. The data collection was carried out through observations from three lessons and interviews with teacher and mother tongue teachers. Recommendations for further studies include to get a better point of view concerning the organisation round mother tongue tuition and how the pupils develop their knowledge. / <p>Educational work/ English</p><p>Pedagogiskt arbete/ Engelska</p>