Problems with diabetes management in adolescents with type 1 diabetes are common - occurring at rates as high as 93% - and have serious health consequences, including poor blood sugar control and risk for later complications. Therefore, the investigators proposed to test a positive psychology intervention for adolescents with type 1 diabetes aimed at increasing motivation for diabetes management; specifically, to increase the frequency of blood glucose monitoring. This intervention will boost positive mood in adolescents (age 13-17) through tailored exercises in gratitude, self-affirmation, small gifts, and parent affirmation as a way to improve motivation for diabetes management. In addition, this study will explore the use of technology, by comparing telephone-administered vs. automated text-messaging versions of the intervention, to determine which mode of delivery is more appealing, convenient, and beneficial for adolescents in managing their diabetes.