In the contemporary international field of education and particularly in Science Education, there is a tendency of limiting the teacher to the role of a passive recipient of knowledge produced in research, followed by the transfer of that knowledge to the classroom. Meanwhile, the dominant tendencies on forming constructivist frameworks, where participatory procedures for discovering and constructing knowledge by the children are encouraged, are in contrast to the prevailing tendency mentioned above. This contradiction leads the teacher to failure, which we believe could be tackled with teacher training programs that promote critical thinking and reflective processes. The following text presents an attempt of a method application for educating adults (TLAE method) for teaching traditional university courses in Sciences Education. According to the findings of the research, the development of critical thinking skills in student teachers is evident. The example of the TLAE method application offers the possibility to enhance traditional teaching approaches with new innovative and experiential practices, while such a perspective could compensate for the inefficacies of teacher training.