1. A system comprising: an analysis engine operable to compare one or more actual output work items from an actual business process to one or more modeled output work items from one or more modeled business controls and report differences between the one or more actual output work items and the one or more modeled output work items, wherein: each actual output work item includes one or more actual output data values, the actual business process changing an actual input work item into the actual output work item; each modeled output work item includes one or more modeled output data values, the one or more modeled business controls executing on one or more modeled input work items and generating the one or more modeled output work items; input data values included in each modeled input work item either match or approximate corresponding values included in a corresponding actual input work item; and each modeled business control is defined by a set of business rules that represent a business policy, the analysis engine being operable to use the set of business rules to generate the one or more modeled output work items using the input data values of the one or more modeled input work items.