In a comprehensive survey conducted by The Economist, Sydney has been rated as one of the world's safest cities, placing in 6th position. Sydney was the highest ranking Australian city, ahead of Melbourne, which placed 9th. Sydney also ranked ahead of international cities such as New York, Hong Kong, San Francisco and London. The Safe Cities Index 2015 is an Economist Intelligence Unit report, sponsored by NEC. The report is based on an index composed of more than 40 quantitative and qualitative indicators. These indicators are split across four thematic categories: digital security; health security; infrastructure safety; and personal safety. Every city in the Index is scored across these four categories. Click here for more information.