“…The location of the school unit, as a living organism, is a matter which is related to factors such as social, economic and spatial structure of a region (the transportation network which serves teachers and students, the distance from the centre of a region, the place (location) of school building's installation (Kouri, 1999;Pucher & Dijkstra, 2003). Indeed it has been observed thanks to researches that in areas with low social and economic level more problems are manifested in the function of school units than in a school in an upgraded, better and socially homogeneous area (Saitis, 2008). Finally, various physical factors, such as cold, heat, noise and poor yard impact negatively on teachers' and students' health and consequently on their performance (Buckley, Schneider & Shang, 2005;Saitis, 2008;Schneider, 2003;Uline & Tschannen-Moran, 2008).…”