Behavioral Activation (BA) is an evidence-based psychological intervention for depression (Cuijpers, Van Straten, & Warmerdam, 2007; Dimidjian, Barrera, Martell, Muñoz, & Lewinsohn, 2011). It has been shown to be as effective as comprehensive cognitive behavioral therapy (Cuijpers et al., 2007) and antidepressant therapy (Dimidjian et al., 2006), with a lower dropout rate than the latter (Dimidjian et al., 2006). There is also evidence that BA works as well as medication and better than cognitive behavioral therapy in the treatment of severe depression (Dimidjian et al., 2006). Moreover, several meta-analyses support the efficacy of BA for the treatment of depression (Cuijpers et al., 2007; Ekers, Webster, Van Straten, Cuijpers, Richards, & Gilbody, 2014; Mazzucchelli, Kane, & Rees, 2009). According to the result of the last meta-analysis conducted (Ekers et al., 2014) - in which 26 randomized controlled trials (RCTs) were analyzed with a total of 1,524 participants - the treatment with BA is superior to the control condition (usual treatment, placebo, or waiting list), showing a high effect size (standardized mean difference, SMD: -0.74, 95% CI -0.91 a - 0.56). In addition, the examination of four RCTs with 283 participants showed that CT is also superior to medication. In this case the effect size was moderate (SMD -0.42, IC -0.83 to -0.00). Finally, according to the results of different studies conducted with several populations, BA can be used in multiple contexts and populations (Dimidjian et al., 2011) such as adolescents (Jacob, Keeley, Ritschel, and Craighead, 2013), seniors (Quijano et al., 2007), university students (Gawrysiak, Nicholas, & Hopko, 2009), and primary care patients (Uebelacker, Weisberg, Haggarty, & Miller, 2009).