The research aimed to highlight the requirements of school environmental projects implementation and focus on the weak points of initial design. The sub queries of the research question are about the target population, the required infrastructure (premises, equipment), the human resources, identification of sources of knowledge, the schedule of implementation phases and the budget. The research method was case study and content analysis of the archival material of School Projects of Environmental Education (SPEEs) in Gymnasiums of Heraklion prefecture, Crete, Greece by the use of criteria based on the principles of Environmental Education and Education for the Sustainable Development guided by UNESCO and European Commission. In all studied SPEEs identified, in general, the required conditions for the implementation, not detailed recorded in Application Forms, but it is obvious from the Final Reports that it happens in the planning phase and in the process of project implementation, depending on the arising needs. The particular detailed and demanding Application Form of the project allows better analysis of project content, of the target group’s expectations, evaluation and feedback methods of the educational process. The existing needs to be improved and enhanced further.
