Using design principles to foster understanding of complex health concepts in consumer informatics tools.

Consumer health informatics tools can only be effective if patients comprehend their content. Optimal design may foster better patient comprehension and health literacy, which can improve health outcomes. We developed a patient-centric decision aid, Tailored Lifestyle Conversations (TLC), to help patients comprehend behavioral risks and set behavior change priorities for reducing risk of cardiovascular disease. The TLC decision aid was developed using a design framework based on Gestalt Principles of Perception. Further iteration was informed by qualitative user feedback. Preliminary analysis showed that the TLC decision aid helped patients understand their risk and supported their decisions on health behavior change. We identified design elements that supported patient comprehension, and other elements that were not effective, to inform iterative revision. This paper describes an effective methodology for the development of consumer health informatics tools that includes grounding in design principles complemented by iterative revision based on user testing and feedback.