This Treatment Improvement Protocol (TIP) is designed to assist you—the substance abuse counselor—in working with clients who are experiencing depressive symptoms. These symptoms occur along a continuum of intensity from mild to severe. When they reach a certain level of intensity and frequency, they become consistent with a diagnosis of a mood disorder, such as major depressive disorder, dysthymic disorder, substance-induced mood disorder, or bipolar disorder. It is clear from clinical research and practice that a significant percentage of your clients have depressive symptoms. Some, but not all, will have these depressive symptoms in the context of a mood disorder diagnosis. Even if you will not be diagnosing and treating depressive illnesses—which is in the scope of practice of those mental and behavioral health professionals licensed in your State to diagnose and treat mood disorders, and capable of doing so—you will be providing substance abuse counseling to clients with these diagnoses and to clients with depressive symptoms but whose mood states do not reach a level that would warrant a mood disorder diagnosis (that is, clients whose symptoms do not meet the diagnostic criteria).