This paper presents the evaluation of the program "Outdoor Classroom" of Reserva Los Coyotes (Mata de  Plátano,  Goicoechea,  in  San  José,  Costa  Rica),  in  order  to  evince  it  as  an  innovative  and  effective methodology for formal education. During 2010, the level of knowledge of participating students (n = 1085) was assessed before and after the field work, using quiz-like instruments. The analysis of the results indicated that the moment of testing (before / after) has a significant effect on the grade obtained, ie as a result of their work at Los Coyotes the number of correct answers increased significantly. To compare the efficiency of this methodology to the traditional education system, post-visit assessments were also administered to a control group (n = 498). The results revealed that participating students have a better handle of the topics developed than the students in the control group. Additional surveys were applied to students and teachers  from the participating schools; both teachers and students showed high levels of satisfaction and rated the program as an effective tool in the teaching of formal contents. The survey also identified  the strengths and weaknesses of the program, thus giving Los Coyotes staff important information to reformulate and improve practice.

Formal environmental education; teaching strategies; environment; education; Costa Rica