The purpose of this project is to capture commonalities and differences in the meaning of happiness through qualitative interviews in order to listen to people's voices and reconsider what kind of society we should achieve in 21st Century. In recent years, policy makers have become more interested in subjective well-being than they were before. The European Commission, UK, Bhutan and Japan started projects to develop well-being indicators. Aristotle mentioned that happiness is the meaning and the purpose of life. Therefore, it is inevitable that policy-makers focus not on economic indicators but on happiness. However, recent happiness studies rely heavily on large sample size, quantitative surveys. This kind of surveys cannot capture variety of the meaning of happiness. In this research, we are going to ask people not only about current happiness but also "ideal" happiness and hear their voices. By analyzing their voices, we challenge to capture commonalities and differences in the meaning of happiness. Moreover, well balance between our own happiness and other's happiness or nature is essential for 21st century. We try to test if our ideal happiness includes balance between others and nature. Our targeted areas are Japan (43nd in UN World Happiness Report) from Asia, the Netherland (4th in UN report) from Europe, and Costa Rica (12nd in UN report) from Latin America. We will interview around 100-200 persons in each country, analyze their voices with text mining and write academic papers. We challenge a new insight of happiness to global debates.