The term "Third World" was primarily used by the US government during the Cold War to refer to countries which were not aligned with the Soviet Union, nor with the US. It has nothing to do with the state of development a country is in although I am aware of its frequent erroneous use in the sense of "developing country". The "Third World" included countries such as Qatar, which, according to the International Monetary Fund, featured a GDP of $83,841 per capita in 2009 - ranking #1 world wide.