Treating Depression on a Day-to-day Basis: Development of a Tool for Physicians Based on a Smartphone Application

Inclusion Criteria: * Age between 18 and 65 years; * Fulfilling the Diagnostic and Statistical Manual version IV (DSM-IV) criteria of depression assessed by the Structured Clinical Interview; * Patients started their antidepressant treatment less than 5 days before inclusion; * Patient treated in an outpatient setting; * Patient informed of the diagnosis of his disease; * Informed patient with written consent. Exclusion Criteria: * A current mental or psychiatric impairment or disease (schizophrenia, bipolar disorder) that required psychotropic medication or inpatient treatment on a psychiatric ward; * A history of psychosis, including schizophrenia, bipolar I or bipolar II disorder, and major depressive disorder with psychotic features; * Cognitive deficit and not thus being able to comprehend the informed consent and study procedure; * Patients with somatic, cognitive or other disorders preventing the use of the device (deafness, impaired vision, illiteracy….); * Non-comprehension of the French language