 Measures that will be utilized in this study can be divided into two groups. One group is observer rated and the other group is subject rated. The observer-rated instruments include the Antidepressant Treatment Response Questionnaire ATRQ, Montgomery-Åsberg Depression Rating Scale MADRS and the Hamilton Rating Scale for Depression HAMD 17. Subject-Rated measures include the Inventory of Depressive Symptomatology-Self Report Version IDS-SR and the Client Satisfaction Questionnaire CSQ 8. 