Based on the work of HealthCom, a fifteen-year, twenty-country project funded by the U.S. Agency for International Development, the book builds on a practical, five-step model for communication that promotes change in existing behaviors and supports preventive health practices. Using numerous examples from actual health communication projects in developing countries - including immunization, diarrheal disease control, and water and sanitation programs - the authors provide step-by-step guidance in applying.