This handbook, designed primarily for use in the development of existing elementary school sites, has the overall objective of defining a process approach to the development of a school site for use in environmental education. This approach involves the student body, school personnel, and the community in the planning, development and use of the school site as a green island for school and community use. Specific objectives of the handbook are: (1) to establish a rationale for developing school sites for use in environmental education: ecological, instructional, economic, and community benefits; (2) to provide guidelines for organizing a school site development effort; (3) to point out pitfalls one may encounter in site development efforts; (4) to provide strategies, ideas, and techniques for teachers to use in order to draw the most instructional benefit from the development and use of the school site; (5) to point out ways to achieve the maximum number of spin-off benefits from the development of the site; and (6) to provide selected references to written materials and available institutional and human resources. This handbook is written with the belief that one motivated individual can rally the school and community interest and support necessary to cooperatively develop a school site. (Author/BT)