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London (CNN) -- Australia has been revealed as the world's happiest industrialized nation, taking the title for the fourth year running.
The so-called "lucky country" beat Norway and Sweden to take the top spot in the Organisation for Economic Cooperation and Development's (OECD) Better Life Index.
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The OECD, an international organization uniting high-income developed countries, ranks its members according to 11 different criteria, which it views as essential to a happy life.
Its happiness index -- one of many such indexes published each year -- is the product of ten years' research, Romina Boarini, head of OECD's monitoring well-being and progress unit, said. It differs from other indexes due to its high quality of data and interactivity with users, she added.
The OECD began investigating contributors to happiness and well-being in the early 2000s, looking at straight-forward indicators such income and wealth alongside others which are more difficult to quantify, such as civic engagement.
Other indicators used are health and education, the quality of local environment, personal security and overall satisfaction with life. The data is then analyzed to ensure it can translate across the OECD countries.
Australians enjoy above average quality of life in nearly all of them, according to the report published on Monday.