IMPACT (Improving Mood–Promoting Access to Collaborative Treatment) is an intervention for patients 60 years or older who have major depression or dysthymic disorder. The intervention is a 1-year, stepped collaborative care approach in which a nurse, social worker, or psychologist works with the patient’s regular primary care provider to develop a course of treatment. Intervention participants receive a 20-minute educational videotape and a booklet about late-life depression and are encouraged to have an initial visit with a depression care manager (DCM). During the first visit, the DCM completes an initial assessment, provides education about treatments, and discusses the patient’s preference for depression treatment (i.e., antidepressant medications and psychotherapy). All patients are encouraged to engage in behavioral activation such as physical activity or pleasant events scheduling. The IMPACT treatment algorithm suggests an initial choice of an antidepressant medication or a course of Problem Solving Treatment in Primary Care (PST-PC), six to eight sessions of brief structured psychotherapy delivered by a DCM in the primary care setting.