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

Correspondence: Edgar A. Whitley, Department of Information Systems, London School of Economics and Political Science, London, U.K. E-mail: e.a.whitley@lse.ac.uk, http://personal.lse.ac.uk/whitley

Received 2 August 2005; Revised 27 September 2005; Accepted 28 September 2005.