<qa>  What is the specific aims of the study?The specific aims are: 1 to determine if the addition of stress reduction strategies packaged in BASIC enhance the effects of BA, as indexed by the rate early remission; 2 to investigate if exposure to BA and BASIC reduce risk of relapse within three months of treatment termination, as indexed by reduced rates of relapse by the 3-month follow-up; and, 3 to learn if effects of BA are mediated by changes in activity behaviors or the acquisition of compensatory behavioral skills, and likewise whether enduring effects of BASIC are mediated by changes in stress regulation or the acquisition of stress regulation skills. Our approach is to compare BA and BASIC to a self-guided bibliotherapy of BA control condition using a randomized clinical trial design to distinguish between conditions. We anticipate that this study will promote our understanding about the efficacy of BA and the discovery of mechanisms of treatment response. We expect this project to facilitate our understanding of the mechanisms that promote treatment gains and contribute to depressive relapse. 