The prevalence of diabetes mellitus is high and expected to increase in the future. It is unlikely that current systems of care will be adequate to provide care to patients with diabetes in the future. This study will evaluate a model of care of care , based on the Chronic Care Model, which has been provided to improve the care of patients with chronic diseases like diabetes. Patients may benefit due to improved care for their diabetes. Health care providers may benefit through an increased understanding of best methods and organization to provide care to populations of patients with diabetes and other chronic diseases.