The particular survey into sexuality in Holland was co-ordinated by the market and opinion research department of the publishing house concerned. An advisory committee was formed consisting of the Attwoods Netherlands team charged with the conduct of the research and of quite a number of acknowledged experts from the fields of social science, sexology, gynaecology, and statistical analysis. Considerable help was also obtained from the Dutch Institute for social sexological research and from the Department of Applied Psychology of the University of Nijmegen. A major part of the psychological pilot test was carried out by the Netherlands Institute for Psychological Market Research. The research approach also took account of related work carried out abroad and of a detailed appraisal of published work. It goes without saying that it was impractical in one survey to cover the whole field of sexual problems or to study particular aspects in great depth. The survey should therefore be regarded as basic fact-finding; and the collected data related both to attitudes to sex and to sexual behaviour patterns.