The study was conducted in four phases. In the first phase,
the researchers sought to improve the usability of PmEB
based on the usability literature. In Phase 2, there was an inlab evaluation with six domain experts in behavior informatics. Then in Phase 3, a user study with six participants
that included a week-long deployment was conducted.
Finally, in Phase 4 there was a feasibility study with 15
participants that included a month-long deployment. Each
phase in the design builds on the findings of the previous,
evaluating progressively more complex human–computer
interactions. The application was reprogrammed following
each phase.