The application of theory to practice can be challenging. This article describes the experiences of one organization in applying the Transtheoretical Model (TTM) to a health promotion program for older adults, Health Stages. The concepts of the model, especially stage of change, were successfully used for program planning, curriculum development, and program evaluation. A Programming Grid was developed to guide curriculum development and evaluate if programs were reaching out to people at all stages of readiness to make healthy changes. Other TTM constructs, including self-efficacy, decisional balance, and processes of change were incorporated into the Health Stages curriculum. Evaluation showed that the pilot sites increased their offering of action- and maintenance-oriented programs, filling in the gaps in current programming. Older adults were receptive and interested in the model. The TTM enhanced the program by providing a framework for design and a method for reaching a wider audience of older adults with important health information.