This manual was developed to train Peace Corps volunteers and other community health workers in oral rehydration therapy (ORT) and the control of diarrheal diseases. Using a competency-based format, the manual contains six training modules (organized in 22 sessions) that focus on interrelated health education and technical content areas. Each module begins with a set of behavioral objectives and contains a sequence of sessions that address the specific content area. Session formats include targeted time frame, overview, objectives, resources, materials, procedures, and trainer notes. The modules cover the following topics: climate setting and assessment; diarrhea, dehydration, and rehydration; nutrition and diarrhea; working with the health system; working with the community; and community health education. Extensive examples, sample forms, schedules, and handouts are provided. Materials are illustrated with photographs and line drawings. Suggestions to the trainer for adapting the materials for different countries and different learners are included in the training packet. (KC)