an investigation of domestic laundry in europe - habits ... - SIFO

2 Assessment of the consumer laundryhabits - a quantitative surveyRagnhild Brusdal2.1 Data collection and data material2.1.1 The dataFour countries participated in the survey, all selected for different reasons asdescribed earlier. A draft questionnaire was drawn up in Norway and discussedwith the other countries involved, and the necessary corrections andchanges were made. The questionnaire was written in English and later translatedto the local languages in collaboration between SIFO and the affiliates ineach country.In each country a sample of approximately 1000 persons was selected fromthe population. The data was collected in February and March 2002. InGreece, the Netherlands and Norway data collection was done by telephoneinterviews (CATI). In Norway, the Norwegian Gallup was responsible for thedata collection, and in Greece and the Netherlands the surveys were run parallelwith Gallup Partner Institute Taylor Nelson Sofres. In Spain theEDOCUSA did the data collection by conducting direct interviews in thestreets, shopping malls and other crowded areas of 22 representative Spanishcities. When the questionnaires had been filled out they were sent to Norway,where Gallup did the data processing.