Environmental awareness is evaluated related to cognitive and affective areas so it might be considered one of the important points in order to predict environmental behavioural change. One of the behavioural change models is ecological dynamics model (EDM) and this model's characteristics overlap with ecopedagogy-based outdoor experiential education (EOEE) and the titles of Agenda 21. The aim of this study is to examine the efficiency of an EOEE program intended for in-service teachers on environmental awareness and to evaluate EDM within EOEE. Mixed methodology was used and the data were collected by an environmental awareness scale, participants' diaries, non-participant observation, and meeting documents. The study found that the participants developed environmental awareness and tended to have holistic perspective at the end of the education. It is come up with that holistic perspective may be added to the EDM and this model can be checked out by mathematical models such as structural equation modelling.