“…Field deployment (real-time use of the application by consumers in the intended setting), with or without participant observation, was the most common testing design used. This approach was taken in 3 nutritionimprovement trials (36,48,50) and 13 application-development projects (65,68,70,72,74,76,79,80,85,(88)(89)(90)92). Other common approaches were testing of application components (36,52,75,85) and focus groups (73,85,86).…”