LAUSR

Mobile phone apps have become ubiquitous in health, but they often fail to demonstrate effectiveness in achieving behavior outcomes among intended users. A failure to conduct formative research on app content or functions may contribute to some of this shortfall. We describe simple research procedures we followed when building a nutrition app for low-income household cooks. Our studies improved the placement and design of key screen controls, helped select and guide an illustrator who created graphic support for textual content, and tested whether adding secondary users to the primary audience would attract additional app use. Whether because of these preliminary tests, or for other reasons, our app has generated heavy use by its intended market and has demonstrated desired effects on client behavior. We offer our experiences in formative evaluation as potential tools for other app developers to adapt to their circumstances.