Abstract: A facility is provided for improving the quality of data that is stored in a data base. Such improved quality is achieved by tracking the operation of various processes controlling respective data processors, which assemble/modify a data record that is ultimately stored in the data base such that random ones of the data records are marked prior to supplying them to a first one of the processors and then obtaining from each of the processors a copy of a marked data record that it processes. Copies of respective data records are then analyzed to determine which of the processes may be corrected to improve the quality of the data that is stored in the data base.