The RDSI is a self-report measure designed to quickly assess symptoms of depression in adults. The RDSI items assess the contemporary symptoms of depression specified by the DSM-IV™ for Major Depressive Disorder. Although the RDSI does not provide a formal DSM-IV diagnosis, clinicians can use the empirically derived cutoff scores to identify those individuals who may be at risk for more serious, diagnostic forms of depression. The RDSI development sample consisted of 855 adults: 531 non-referred community adults and 324 psychiatric outpatients, including 150 outpatients diagnosed with Major Depression. The RDSI Professional Manual provides normative data based on a sample of 450 non-referred community adults.