Participatory data collection relies on the commitment
of the participants to report data continuously, which
makes providing incentives to people crucial. In this
case study, we describe how we designed a web app by
using different incentive mechanisms to collect
participatory data for monitoring community health.
The insights we gathered through evaluating the
prototype in focus groups and the lessons we learned
about sustaining motivation and interest are discussed
in the paper. We expect that these lessons would be
useful for other participatory sensing projects that aim
for constant and systematic data contribution from a
large group of people.