This handbook, based on experiences with projects in Thailand and Nepal, was written for field staff in protected areas, particularly in Third World countries. Chapter 1 discusses environmental objectives, preparation of background information, sources of information, topics for education and interpretation, target groups, facilities and approaches, and obstacles in planning. Chapter 2 focuses on nature trails, including preparation of nature trails, trail interpretation, methods of interpretation, trail construction, and costs. Chapter 3 focuses on the general principles and techniques of outdoor signs, including types of signs. General principles, techniques, and construction of outdoor and indoor displays are discussed in chapter 4. Methods of fund raising and preparing a talk are addressed in chapter 5. A general discussion of "advanced facilities" is provided in chapter 6, focusing on slides/movies, visitor centers, mobile units, and live animal exhibits. Ancillary materials in chapter 7 include a protected area information sheet, example of handout for special subject trial (with checklist and sample teachers guide), example of trail guide with stations, list of inexpensive literature, and places to contact for further information. (JN)