Computer-assisted cognitive-behavior therapy (CCBT) for depression in primary care will be evaluated in a trial with 320 patients randomly assigned to CCBT or treatment as usual (TAU). The study will disseminate a therapy method found to be effective in psychiatric settings into primary care - a setting where there have been significant problems in delivery of adequate, evidence-based treatment for depression. The study will include a high percentage of disadvantaged patients - a population that has been largely ignored in previous research in CCBT. There have been no previous studies of CCBT for depression in primary care that have enrolled large numbers of disadvantaged patients. The form of CCBT used in this study is designed to increase access to effective therapy, provide a cost-effective method, and be a sustainable model for wide-spread use in primary care.