HealthStagesIn 2004, Oasis collaborated with Washington University for a published article that described the use of the Transtheoretical Model of Behavior Change (TTM) in the development and evaluation of a pilot health education program for older adults.  The program was called HealthStages and was the first health education component of Oasis. Oasis centers had been offering health classes for more than 15 years, but there was no planned approach to programming, needs assessment, or an evaluation of program effectiveness.  Certain topics would be offered only because a speaker was available, or because a sponsor wanted to promote a certain service.  HealthStages was initiated to develop a comprehensive health education strategy to identify and meet the needs of this growing number of older adults.  The purpose of HealthStages was to develop health education, disease prevention, and chronic disease self-management strategies that would have positive implications for older adults as well as the health care system.  Developed in collaboration with health professionals at the Washington University School of Medicine, HealthStages was initiated and piloted in three cities where Oasis centers were located:  St. Louis, Missouri, Portland, Oregon, and Tucson, Arizona. The article reviewed the components of the TTM, described how the model was used with HealthStages, and discussed the implications for health education for older adults.  The HealthStages program was found to operationalize the TTM in a way that was useful for program planning, implementation, and evaluation.  HealthStages used the stages of change model as a guide for addressing the interests and needs of older adults at all stages of readiness for behavior change.  Program participants were interested in the model, and strategies from the TTM were woven into the context of HealthStages materials.  It was found to be a practical theory for health education programs.  (Health Promotion Practice January 2004  Vol. 5, No. 1, 88-93 DOI:  10.1177/1524839903257305  ©2004 Society for Public Health Education)