Abstract
The collection of data for geographic and planning research by means of interviewing is a time-consuming and costly affair. A new method of interviewing, computer-assisted telephone interviewing (CATI), makes it possible to reduce labour input and financial costs. Programs to carry out CATI on microcomputers were developed by the Department of Geography at Utrecht University. The technique was applied to collect data for research projects on retailing and commuting in a planning context. As an example, it is demonstrated how the collected data were used in a shopping model of spatial interaction type in order to make conditional forecasts of retail spending in the province of Utrecht, Holland.

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