Aim: To explain the factors affecting glycemic control (measured by HbA1c) following the Dose Adjustment for Normal Eating (DAFNE) program. Background: DAFNE is a structured education program designed to assist persons with type 1 diabetes mellitus achieve optimal glycemic control. However, not all participants reach this goal. Few studies comprehensively explain why this is the case. Research Design: A concurrent mixed methods design. Data were collected from participants (n = 34) at three time points post DAFNE in five participating sites. Each data set was analyzed separately and then integrated. Results: Motivation and support differed for participants who were out of control and those in control. Conclusion: Setting targets/goals and motivations are key in helping participants attain optimal HbA1c.