Greek school community emphasizes on the discovery direction of teaching methodology in the school Environmental Education (EE) in order to promote Education for the Sustainable Development (ESD). In ESD school projects the used methodology is experiential teamwork for inquiry based learning. The proposed tool checks whether and how a school program follows discovery teaching approaches under the principles and guidelines of EE and ESD. The criteria focus on the active teaching and learning which promote student discover, regarding the role of the community as a learning environment which can cultivate active, environmentally responsible citizens. The Evaluation Tool answers 3 research questions and 17 sub-queries with 47 criteria on the skills for implementation of discovery teaching method, the process of discovery teaching method and the learning environments.