Mobile Phone Sensing and Outreach as Adjuncts to Internet-Based Behavioral Intervention for Depression

Inclusion Criteria: * PHQ-9 score 10 or higher * Has an e-mail account, computer, and broadband access to the Internet * Familiarity with mobile phones and is within a cellular network range the majority of the day. * Is able to speak and read English. * Is at least 19 years of age. Exclusion Criteria: * Hearing or voice impairment preventing participation in psychotherapy. * Visual impairment that would prevent use of the website, mobile phone application, and assessment materials. * Has any psychiatric condition for which participation in a clinical trial of psychotherapy may be either inappropriate or dangerous (e.g., psychotic disorders, bipolar disorders, dissociative disorders, etc.). * Planning to be out of town or unavailable for intervention for 1 or more weeks during the scheduled study participation. * Exhibits severe suicidality, including ideation, plan, and intent.