Improving the quality of educational programs and the demand for accountability have put the professional development of Extension educators high on Cooperative Extension's agenda. Effective professional development facilitates improved program design and implementation, which, in turn, translates into higher clientele satisfaction. The purpose of this article is to discuss the principles and practices of adult education and their application in designing professional development offerings with specific examples for Extension educators. Using the integrated approach of learning, the authors present a framework and share their experiences for the application of practice in designing professional development programs for Extension educators.