The Boston Schools Environmental Initiative (BSEI) program worked with several Boston Public schools to foster “hands-on, minds-on” science and environmental awareness. The overall finding from this evaluation, conducted over four academic years, was that the longer a school participated in the BSEI program, the more the culture and operations of the school changed in the direction of the intended BSEI outcomes. BSEI is a program of Mass Audubon’s Boston Nature Center (BNC), which places a teacher naturalist part time in each school, and provides ongoing professional development and project