Foreword Introduction; S.Gerlach & P.Gruenwald Procyclicality and Volatility in the Financial System: The Implementation of Basel II and IAS 39; A.Taylor & C.Goodhart Comments on 'Procyclicality and Volatility in the Financial System: The Implementation of Basel II and IAS 39'; D.Burton, W.A.Ryback & J.Viñals Sources of Procyclicality in East Asia Financial Systems; R.S.Craig, E.P.Davis & A.G.Pascual Comments on "Sources of Procyclicality in East Asia Financial Systems"; H.Mingzhi & T.Wantanagase Procyclical Financial Behaviour: What Can be Done?; P.Lowe & G.Stevens Comments on "Procyclical Financial Behaviour: What Can be Done?"; M.Gudmundsson, E.Hirano & A.Sheng