Open car-sharing organizations in Sweden today have some 2000 members and have about 200 cars at their disposal. It has been estimated that approximately 870,000 households could be incorporated into such organizations. If large-scale use of car-sharing is to be achieved during the next 10 years, encompassing say 10 % of the potential, the systematic recruitment of members to existing pools, particularly in large cities, will be needed. Recruitment of many members within a small geographical area results in a high density of available cars and of members, a high level of expertise and of service, and considerable advantages.