Open Trial of an ACT Skills Group and Mobile App for Worry

This study is an open trial of acceptance and commitment therapy (ACT) groups combined with a mobile app for the treatment of Generalized Anxiety Disorder (GAD). The goal of this study is to evaluate if ACT groups and a mobile app are efficacious and acceptable in the treatment of GAD. Study hypotheses are: 1. Group ACT will lead to improvement in worry, anxiety, comorbid depression, functioning, and well-being. 2. Group ACT will also lead to improvement in theoretically relevant processes, namely psychological inflexibility, anxiety-related fusion, mindfulness, and progress towards values. 3. Combining a mobile app with group ACT will be credible, acceptable, and satisfactory to participants.