The UK Information Commissioner has issued guidelines on what constitutes a vexatious Freedom of Information application that could be useful in those Australian jurisdictions where the act includes a similar provision.
A vexatious application is one that imposes a significant burden in terms of distraction or expense to an agency and also meets one of the following criteria:
- clearly doesn't have any serious purpose or value;
- designed to cause disruption or annoyance;
- has the effect of harassing the agency;
- can otherwise fairly be characterised as obsessive or manifestly unreasonable.
The UK FOI blog provides a link to the document.