Disclosed herein is a system (10) for determining the compatibility of a purchaser with a plurality of real properties on offer. The system (10) is arranged to exclude those of the plurality of real properties on offer that match at least one exclusion criterion. The system (10) is arranged to use a plurality of characteristics to generate, for each of the non-excluded ones of the plurality of real properties on offer, a property compatibility index. Each property compatibility index is indicative of a degree of compatibility between the corresponding real property and the purchaser. The plurality of characteristics comprise at least one characteristic of the purchaser and at least one characteristic of each of the non-excluded ones of the plurality of real properties on offer.