This book is a revision of the hugely successful first edition of Mastery of Your Anxiety and Worry, Therapist Guide. It is designed to be used in conjunction with the accompanying Workbook. This new Guide is for practising mental health professionals who treat adult clients diagnosed with Generalised Anxiety Disorder and/or excessive worry. It lays out a 12-lesson program of new procedures to help clinicians teach their clients to learn to monitor their anxiety, gain control and initiate needed change. Cognitive-behavioural techniques such as cognitive restructuring and in vivo exposure are explained. The treatment offered is evidence-based and proven to be effective.