Methodology
The information presented on this site is taken from a major survey conducted by the Ipsos Institute at the request of Veolia Environnement.
Fourteen cities across five continents were selected: Alexandria, Beijing, Berlin, Chicago, London, Los Angeles, Lyon, Mexico City, New York, Paris,Prague, Shanghai,Sydney and Tokyo.
The sample of respondents included 8,608 people aged from 15 to 70 years, in the 14 cities covered by the survey. Each sample was compiled using the quota method reflecting the available socio-demographic data (sex, age, profession and sector in most cases).
The quantitative phase of the survey involved a questionnaire, sent via the Internet, to approximately 600 residents of each of those cities, for a total of more than 8,500 respondents.
The survey's qualitative phase involved face-to-face interviews with groups of young city dwellers.
The quantitative phase
The survey was managed over the Internet by Ipsos panel members. In Prague and Alexandria, because of relatively low Internet access among households, the survey was done face-to-face at the respondents' homes.
The qualitative phase
The qualitative phase of the study was conducted with focus groups of young city dwellers with an above average socio-cultural and economic level.
In each city, with the exception of Lyon, Beijing and Los Angeles, a focus group of eight young city dwellers, men and woman, in employment and aged between 20 and 27 was questioned.
In New York, Paris and London a second focus group was questioned. It had the same characteristics as the first but the socio-cultural background was more modest. In Alexandria, two mini focus groups of 5 people each were set up , in order to question men and women separately.
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