In a paper at the 2009 Ubicomp conference, Hao-Hua Chu and his students and colleagues presented results of a trial of a system that encourages people to drink more water. They built a tracker that sensed water consumption from a special bottle.
Some subjects got an individual feedback app. When they drank enough, their tree avatar was healthy; when they didn’t, it lost its leaves.
Five subjects got a version with two social features:
- They could see small representations of the other four users’ tree avatars
- They could send reminders to other users (in the form of heart icons, suggesting “I care about you, so drink!”)