An efficient and reliable technique is disclosed for detecting faults which occur in FIFO’s, including control faults which are specific to FIFO’s, as well as faults common to conventional memories, such as interport faults and faults that occur in single port memories. The tool includes a first lever and a second lever. Each of a first subset including two or more of the plurality of data warehouses may be configured to store a respective replica of a first data set extracted by the data warehouse manager.