Typically viewed as competing design approaches, this paper illustrates how claims and personas can be used together in user interface design. Our combined approach is exemplified in the development of a notification system called NotiFly. We introduce the idea of claims-based personas as a design tool in a scenario-based approach. Following a discussion of NotiFly's development, we speculate on the theories that led to the system development and how they might impact HCI design process. Based on the findings encountered during the development of NotiFly, we present direction for future work to better systems like Notifly and notification systems in general. Categories and Subject Descriptors