Collaborative teaching approach has confused teachers in Greece, who although generally argue in favour of this, however, state that they are unable to incorporate it into their daily teaching practice. Thus, collaborative action research, as a form of training, has been implemented to a group of teachers in order improvement to be achieved. The opinions and feelings of the participants are presented in the following article. Analyzing the facilitator's observation notes and the participants' interviews seems that action research has triggered a change in pupils' learning process. Additionally, teachers exchanged ideas, expressed themselves without hesitation and adopted innovations. According to the researcher, teachers' hard and lonely work is supported through the collaborative action research. This kind of training focuses on their needs, takes place at their own school, while the member of the University and the researcher undertake the support work. With this effort, the classroom can be transformed into a modern school environment, more active, experiential and collaborative one.