Corporate scandals and misconduct in the workplace will always be around. No strategy or set of controls can ever completely shield a company to the risk of fraudulent behavior. But a lesson that often needs repeating and relearning is that how you conduct the internal investigation can be as critical as the effect of the underlying misdeed itself.

A good internal investigation can make the difference between a problem that is caught early and headed off and one that spirals out of control into a massive fiasco; just ask News Corp. or Hewlett-Packard.

Internal auditors and compliance professionals offer a ...