Many training programs have been developed in diverse settings to prepare nonformal educators for specific tasks. A comprehensive curriculum for nonformal educators, however, has eluded international educators. This article describes a case study in curriculum development and evaluation which was undertaken in Pennsylvania and Mexico to remedy this gap. A manual was developed, and evaluated by university students and extension agents in Pennsylvania. It was then used to teach similar audiences in Monterrey, Mexico. Evaluations of the curriculum in the classroom and in workshops indicated that the curriculum was well received in these settings. Gaps and weaknesses in the manual were identified. A revised and expanded version of the curriculum was developed which has promise for a variety of nonformal education settings around the world. It has potential for organizations that promote community development, youth development, health education, adult education, and nonformal leadership development.