The epidemiology of worry and generalized anxiety disorder / Robert M. Holaway, Thomas L. Rodebaugh and Richard G. Heimberg -- Worry and rumination: styles of persistent negative thinking in anxiety and depression / Costas Papageorgiou -- Worry in psychopathology / Christine Purdon and Jennifer Harrington -- Worry and information-processing / Gerry Matthews and Gregory J. Funke -- Worry in older adults / Julie L. Wetherell -- Worry in childhood and adolescence / Sam Cartwright-Hatton -- The Penn State Worry Questionnaire (PSWQ) / Helen M. Startup and Thane M. Erickson -- The anxious thoughts inventory and related measures of metacognition and worry / Adrian Wells -- Assessment of generalized anxiety disorder / Cynthia L. Turk and Andrew T. Wolanin -- The catastrophizing interview procedure / Graham C.L. Davey -- The metacognitive model of worry and generalized anxiety disorder / Adrian Wells -- A cognitive model of generalized anxiety disorder: the role of intolerance of uncertainty / Naomi Koerner and Michel J. Dugas -- A mood-as-input account of perseverative worrying / Graham C.L. Davey -- The cognitive avoidance theory of worry / Nicholas J. Sibrava and T.D. Borkovec -- Metacognitive therapy for worry and generalized anxiety disorder / Adrian Wells -- Applied relaxation and cognitive therapy for pathological worry and generalized anxiety disorder / T.D. Borkovec -- A cognitive-behavioural treatment targeting intolerance of uncertainty / Melisa Robichaud and Michel J. Dugas -- Pharmacological treatments for worry: focus on generalized anxiety disorder / Ian M. Anderson and Marisha E. Palm -- Case histories: treating worry across disorders / Paul King -- The efficacy of psychological treatments for generalized anxiety disorder / Peter L. Fisher -- Predictors of treatment outcome / Robert C. Durham.