Personas are a widely used tool to keep real users in mind, while avoiding stereotypical thinking in the design process. Yet, creating personas can be challenging. Starting from Cooper's approach for constructing personas, this paper details how behavioral theory can contribute substantially to the development of personas. We describe a case study in which Self-Determination Theory (SDT) is used to develop five distinctive personas for the design of a digital coach for sustainable weight loss. We show how behavioral theories such as SDT can help to understand what genuinely drives and motivates users to sustainably change their behavior. In our study, we used SDT to prepare and analyze interviews with envisioned users of the coach and to create complex, yet engaging and highly realistic personas that make users' basic psychological needs explicit. The paper ends with a critical reflection on the use of behavioral theories to create personas, discussing both challenges and strengths.

The amount and nature of value in a particular product or service always lie in the eye of the beholder, of course. Yet universal building blocks of value do exist, creating opportunities for companies to improve their performance in current markets or break into new ones. A rigorous model of consumer value allows a company to come up with new combinations of value that its products and services could deliver. The right combinations, our analysis shows, pay off in stronger customer loyalty, greater consumer willingness to try a particular brand, and sustained revenue growth. We have identified 30 “elements of value”—fundamental attributes in their most essential and discrete forms. These elements fall into four categories: functional, emotional, life changing, and social impact. Some elements are more inwardly focused, primarily addressing consumers’ personal needs. For example, the life-changing element motivation is at the core of Fitbit’s exercise-tracking products. Others are outwardly focused, helping customers interact in or navigate the external world. The functional element organizes is central to The Container Store and Intuit’s TurboTax, because both help consumers deal with complexities in their world.