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Longitudinal mood instability is the essential feature of bipolar disorder, however most rating scales are cross sectional in nature, and focus on acute symptoms. By contrast, the NIMH Life Chart Methodology (LCM) characterizes in detail the severity, duration, and frequency of mood episodes. Unfortunately, adherence to daily rating tends to be low. Compared to the traditional paper chart, an online adaptation of the LCM that used links embedded in a daily email as the primary form of data entry substantially increased the number of days rated by a sample of patients with bipolar disorder. An analysis of the ways in which users interacted with the application found that manipulation of the user interface affected the number of days that were rated. Features of video games and commercial web sites designed to reinforce repeated long-term use can be adapted to therapeutic applications to support adherence. These features include content delivery, point accumulation, personalization, discovery, and reward.