... accuracy.In addition to invoices,service providers offer customer service records (CSRs),circuit inventories, service con-figuration inventories and equipment inventories which provide details ... charges that roll up to overall invoice cost. These documents, in conjunction with existing inventory information about servicesinstalled, allow customers to create a detailed inventory of the services ... be used to create a baseline for services andassociated cost. Creating an inventory of cost as the first step in inventory development, rather than creating aphysical service inventory, presents...