1. A computer implemented method of assessing vendor performance, comprising: storing a set of data related to a service agency in an electronic database, the set of data having a plurality of at least six datasets; storing in a first one of the datasets a total-budget value, the total-budget value representative of a sum of money the agency has paid for a plurality of service items provided by a plurality of vendors in a plurality of cases wherein each of the plurality of service items is substantially the same type of service item as the other service items and wherein each vendor provides one or more service items in each of one or more cases of the plurality of cases assigned to the vendor; storing, for each case assigned to each vendor, in a second one of the datasets an amount-paid value, the amount-paid value representative of the corresponding payment from the service agency; storing, for each case assigned to each vendor, in a third one of the datasets a case-score value, the case-score value representing a value of the service items provided by each vendor; storing in a fourth one of the datasets a total-case-score value, the total-case-score value formed by summing the case-score values stored in the third one of the datasets; storing, for each case assigned to each vendor, in a fifth one of the datasets a vendor-service-score value, the vendor-service-score value corresponding to a certain relative value added to the case via the provision of the one or more service items of the plurality of service items provided by each vendor in exchange for a corresponding payment from the service agency; storing in a sixth one of the datasets a total-vendor-services-score value, the total-vendor-services-score value formed by summing the vendor-services-score values stored in the fifth one of the datasets; iteratively selecting each vendor of the plurality of vendors; executing instructions with a computing device, the instructions stored in a memory associated with the computing device, the execution of the instructions arranged to carry out the act of forming a vendor-score-contribution value associated with each of the plurality of vendors, the vendor-score-contribution value formed by: mathematically combining the total-budget value, the vendor-service-score value of the selected vendor, and the total-vendor-services-score value to form a case value; distributing the case value to the one or more service items of the plurality of service items provided by the selected vendor; and computing a net contribution of the selected vendor by mathematically combining the distributed case value from the amount-paid value corresponding to the one vendor; and outputting a report, the report reflecting the computed net contribution of at least one vendor of the plurality of vendors.