¹Lecturer in Information Systems, Department of Information Systems, London School of Economics and Political Science, London, U.K.

Correspondence: Antonio Cordella, Lecturer in Information Systems, Department of Information Systems, London School of Economics and Political Science, Houghton Street, London WC2A 2AE, U.K. E-mail: A.cordella@lse.ac.uk

Received 11 August 2005; Revised 27 September 2005; Accepted 29 September 2005.