The Beck Depression Inventory (BDI) is a widely used self-report measure for assessing the severity of depression. It is composed of 21 items intended to assess the intensity of depression in clinical and normal patients. Each item is a list of four statements arranged in increasing severity about a particular symptom of depression. Each of the 21 items is scored on a scale from 0 to 3. This scoring is based on the intensity of the symptoms over the past two weeks, including the day of assessment. The items on the BDI assess symptoms such as mood, pessimism, sense of failure, self-dissatisfaction, guilt, punishment, suicidal ideas, crying, irritability, social withdrawal, body image change, work difficulties, insomnia, fatigue, appetite, weight loss, bodily preoccupation, and loss of libido.