Internet-based treatment of generalized anxiety disorder, and/or social phobia, and/or panic disorder (the Anxiety program): A randomized controlled study exploring the role of a clinician.

INTERVENTION: Participants will be randomly assigned to one of three groups: Group 1) Treatment with self‐guided Internet based treatment for GAD and/or social phobia, and/or panic disorder, or; Group 2) Treatment with clinician‐assisted Internet based treatment for GAD and/or social phobia, and/or panic disorder, or; Group 3) Waitlist control. All participants will meet Diagnostic and Statistical Manual of Mental Disorders 4th Edition (DSM‐IV) criteria for GAD and/or social phobia, and/or panic disorder. All group 1 and group 2 participants will complete 8 lessons of Internet based treatment about the management of anxiety symptoms. One lesson will be completed every 7 to 14 days. Each lesson will take about 15 minutes to complete. Group 1 participants will have access to summaries of each lesson, and will receive weekly reminder emails. Group 2 participants will have access to summaries of each lesson, will contribute to an online forum moderated by a clinical psychologist or psychiatrist, and will receive weekly reminder emails. The duration of the program is up to 10 weeks, but participants will be contacted 3 months post program and asked to complete follow‐up questionnaires. Study questionnaires will be administered at application, pre‐treatment, post‐treatment, and at 3‐month post‐treatment. These will take about 20 minutes to complete. The treatment materials are based on cognitive behavioural techniques CONDITION: Generalised Anxiety Disorder (an anxiety disorder) Panic disorder (with or without Agoraphobia) (both anxiety disorders) Social phobia (an anxiety disorder) PRIMARY OUTCOME: Anxiety is measured by the Depression, Anxiety, Stress Scale ‐21 item (DASS‐21) Anxiety is measured by the Generalised Anxiety Disorder Assessment (GAD‐7) Anxiety is measured by the Mini International Neuropsychiatric Interview SECONDARY OUTCOME: Disability is measured by the Sheehan Disability Scale Generalised Anxiety Disorder is measured using the Penn State Worry Questionnaire Neuroticism is measured by using the NEO‐Five Factor Inventory (NEO‐FFI) Neuroticism scale Panic disorder is measured using the Agoraphobic Cognitions Questionnaire Panic disorder is measured using the Panic Disorder Severity Scale ‐ Self Rated Social phobia is measured by the Social Interaction Anxiety Scale Social phobia is measured by the Social Phobia Scale Symptoms and severity of depression is measured by the Patient Health Questionnaire‐9 INCLUSION CRITERIA: Meet DSM‐IV criteria for social phobia and/or panic disorder (with or without agoraphobia) and/or GAD ‐ Internet access + printer access. ‐ Australian citizen‐ Males and females.