The purpose of the study is to examplify how to use the didatic model communicative approaches to support an proffessional experimental approach in the classroom when teaching science in primary school. This way of teaching science will lead to a more student active and dialogic communicative way of teaching. In this study the research approach didatic modeling was used with the inspiration of the cyclical process from action research. I have designed, implemented and evaluated two teaching cycles and designed a third cycle with the same content. In the study communicative approaches in my design were combined with Concept Cartoons. Furthermore, the didatic model can be used as a support in the implementation and evaluation of teaching science in order to analyse and revise the way of teaching science. In the evalutation the results show how the students get the chance to express themselves and devolope their thoughts in interaction with eachother when consciously using dialogic communicative and student active teaching. This study has exemplified how communictive approaches can be used in the science classroom to support and develop a more dialogic and student active teaching.