The core educational TRIAD intervention was 4.5 hours long and was divided into two sessions, 1 month apart, when implemented in the randomized trial. The intervention also included, if not already in place, the modification of the homecare agency’s procedures to support depression detection and referral procedures. TRIAD was designed to be delivered by a nurse, psychologist, social worker, or medical doctor knowledgeable about geriatric depression and barriers to recognition and referral in the homecare setting. Both instructors for the TRIAD training trial (nurse educator; ELB and psychologist; PJR) had spent time developing the intervention, piloting it, and learning from the staff at the partnering agencies. The following paragraphs provide the rationale for each TRIAD component and describe how the intervention was implemented in the trial.