PIP: From 1980 through 1984 the same communication and social marketing strategy was applied to teaching oral rehydration therapy (ORT) and related child survival practices in both the Gambia and Honduras. Within that strategy, each country developed campaigns that had their own character, peculiarities, and challenges. Data bridging 3 years and the 2 cultures show almost identical results, including sustained adoption of ORT and significant improvement in nutritional practices. This discussion reports on the most interesting similarities, differences, and data from the 2 countries, based on recently published longitudinal studies conducted by Stanford University and Applied Communication Technology. Highly specific objectives were pursued and multiple channels -- radio, print materials, and direct contact -- were coordinated to support these objectives in the campaigns of Honduras and Gambia to teach ORT and related practices. Although emphasis shifted among topics for limited periods of time during the interventions, the key communication methods and procedures for conducting the interventions would not end abruptly but become an ongoing part of the public health education process and the health care delivery system. The interventions in Honduras and Gambia adapted lessons learned from past experiences. The methodological sequence is outlined. Stratified, random panels of approximately 750-1000 households with posttest controls were surveyed in each country in repeated waves over a 3 year period. The overall evaluation plan examined a sequential model of changes, recognizing that changes in any individual do not necessarily follow the same pattern. 1 technique used with strong impact in Gambia was the "Happy Baby Lottery." This was a contest of skill rather than chance and proved successful in overcoming the difficulty many Gambian women expeience in interpreting 2-dimensional graphs. The "lottery" in Gambia marked the beginning of a 2-year effort to teach a water/sugar/salt (WSS) home-mix solution and related diarrheal control and infant feeding practices. The evaluation shows that the mothers learned about ORT and changed their behavior accordingly. An overview of the 2-year data set indicates sustained adoption of WSS solution to treat diarrhea. The campaign in Health Region I of Honduras emphasizing ORT and related diarrheal control and infant feeding practices lasted 2 years and then expanded to the national level and to other topics during the 3rd year -- immunizations, malaria control, and compliance with tuberculosis treatment. The same method of village investigation, behavioral analysis, pretesting, integrated use of multiple channels, and monitoring were applied in developing and implementing a sustained, phased, public health communications intervention. Honduran mothers also learned and changed their practices significantly. At the beginning of the campaign none of the Health Region I mothers had used Litrosol, a newly introduced product, but within 6 months 37% of all surveyed mothers had tried it. By the end of the campaign over 60% of mothers had used Litrosol.^ieng