Some exemptions to public authority obligations to respond to information requests are subject to a public interest test (eg Aarhus Convention, Art. 4, paragraph 4). Such a test requires the decision-maker to take public interestconsiderations into account when deciding whether to release information even where an exemption applies. This study, commissioned by the UK Information Commissioner, examines the application of the test in selected countries (Australia, New Zealand, Canada) and developing practice under UK regulations.