Participants in this open-label study will be randomly assigned to one of two treatment strategies: IPSRT or CSSRT. All participants will attend study visits once a week until they have been stable for 4 weeks (acute phase). At this point, they will attend study visits every other week for 12 weeks (continuation phase), and then once a month for 18 months or until another depressive or mixed episode occurs (maintenance phase). Participants who experience a recurrence will be treated with medication and the type of therapy they were assigned upon study entry (IPSRT or CSSRT). These participants will continue to be followed for a period of time equivalent to their remainder of time in the study had they not experienced a recurrence. Outcomes will be measured at Week 12 of the continuation phase and Week 18 of the maintenance phase.