Medium to large effectiveness: 0.73
1. Utilizes the cognitive model, which states that thoughts, feelings and behavior are all 
connected, and that individuals can move toward overcoming difficulties and meeting their goals by identifying and changing unhelpful or inaccurate thinking, problematic behavior, and distressing emotional responses.
2. Involves the individual working collaboratively with the therapist to develop skills for testing and modifying beliefs, identifying distorted thinking, relating to others in different ways, and changing behaviors.
Evidence:
0.36 small effect: reduced stress (Abbott, Whear, Rodgers, Bethel, Coon, Kuyken, & … Dickens, 2014)
0.35 small effect: reduced depression symptoms (Abbott, Whear, Rodgers, Bethel, Coon, Kuyken, & … Dickens, 2014)
0.50 medium effect: reduced anxiety (Abbott, Whear, Rodgers, Bethel, Coon, Kuyken, & … Dickens, 2014)
1.81 large effect: reduced pathological worry more than no therapy at all (Hanrahan, Field, Jones, & Davey, 2013)
0.63 medium effect: moderately superior to non-cognitive therapies (Hanrahan, Field, Jones, & Davey, 2013)
Abbott, R. A., Whear, R., Rodgers, L. R., Bethel, A., Coon, J. T., Kuyken, W., & … Dickens, C. (2014). Effectiveness of mindfulness-based stress reduction and mindfulness based cognitive therapy in vascular disease: A systematic review and meta-analysis of randomised controlled trials. Journal Of Psychosomatic Research, 76(5), 341-351. doi:10.1016/j.jpsychores.2014.02.012
Hanrahan, F., Field, A. P., Jones, F. W., & Davey, G. L. (2013). A meta-analysis of cognitive therapy for worry in generalized anxiety disorder. Clinical Psychology Review, 33(1), 120-132. doi:10.1016/j.cpr.2012.10.008
How To Therapy 