Acceptance and commitment therapy (ACT) is a third-generation therapy that relates to human suffering as an inherent part of life in the human condition. Concerning personal values, ACT is focused on the acceptance of suffering, by doing away with the avoidance of things that cause us discomfort.

The goal of the therapy is to make a person's reactions to suffering more flexible, working with the role of the symptoms rather than with the eliminating the symptoms themselves.

This paper shows how the application of this therapy to a person with generalized anxiety disorder helps to reduce symptoms such as uncontrollable worrying, lack of concentration and muscular tension that these patients often suffer. The modification of symptoms has been measured by a single case study, where the symptoms are assessed by questionnaires before and after the treatment's application. Diagnosis was made according to the Diagnostic and Statistical Manual of Mental Disorders’ (DSM-IV) criteria.