Information technology practitioners are required to make calls of judgement in both a technical and a professional capacity. Professional codes of conduct and codes of ethics are intended to provide guidance in making such calls of judgement. This paper looks at the Australian Computer Society code of ethics in the light of the information technology strategies employed by the Australian telecommunications company One. Tel Limited. The failure of the company can be seen at least partly as an information systems failure, in particular the failure of its billing system, and we examine where IT practice at One. Tel might have deviated from the ACS code of ethics and discuss issues concerning this deviance.