For cost reasons, it was decided to interview by telephone
where possible. In all countries using Computer-Assisted Telephone
Interviewing (CATI), a regionally well-spread
selection of households was sampled with some variant of random-digit
dialing techniques. Within each household contacted by telephone, a
procedure was used to randomly select a respondent 16 years of age
or older, based on the composition of the household (the Troldahl-Carter
method). No substitution of the selected respondent was allowed.
1988 survey: Persons aged 16 and older living in Australia,
Belgium, Canada, England/Wales, Finland, France, Germany (West), Japan,
the Netherlands, Northern Ireland, Norway, Scotland, Spain, Switzerland,
and the United States. 1992 survey: Persons aged 16 and older living in
Australia, Belgium, Canada, Czechoslovakia, England/Wales, Finland, Italy,
Japan, the Netherlands, New Zealand, Poland, Sweden, and the United States.
personal interviews and computer-assisted telephone