These pamphlets present facts, background information and guides on the immunization of children against preventable diseases. Individual pamphlets are provided for mass media specialists, health personnel in the field, health policy makers and program administrators, as well as university personnel. Contents include a specification of the role of the media in immunization efforts; a discussion of when, against what, and how to immunize; guides for organizing immunization programs; an overview of program planning and implementation considerations; and a review of the biophysiology of immunization. Each pamphlet is given in Spanish, French and English versions. (Author/RH)