A critical review of assessment strategies to measure the behavioral activation model of depression.

Behavioral activation (BA) treatments for depression are based on a model of psychopathology indicating that losses of, reductions in, or chronically low levels of positive reinforcement produce behavioral and emotional changes in depression. The corresponding mechanism theory is that using BA techniques to increase activation will lead to a subsequent increase in positive reinforcement, which will decrease depressive symptoms. We attempt to review BA literature relevant to its psychopathology and mechanism models, paying particular attention to attempts to measure activation as conceptualized within BA treatments and attempts to measure reinforcement. Suggestions on ways in which to improve these measurements in order to better evaluate the psychopathology and mechanism models are provided. 2010 Elsevier Ltd. All rights reserved.