Companies can use a variety of similar measurements to assess the benefits of other electronic commerce initiatives. Supply chain managers can measure supply cost reductions quality improvement or faster deliveries of ordered good auction sites can set goals for the number of auction the number of bidders and sellers the dollar volume of items sold the number of items sold or the number of registered participants the ability to track such numbers is usually built into auction site software virtual communities and web portals measure the number of visitors and try to measure the quality of their visitors experiences.