Many tasks that are normally segregated in manual systems are consolidated in the data-processing function of computer-based systems. Computer programs in the revenue cycle perform inventory control, accounts receivable, billing, and general ledger tasks. In this situation, the auditor’s concern should focus on the integrity of the computer programs that perform these tasks. The following questions need answers: Is the logic of the computer program correct? Has anyone tampered with the application since it was last tested? Have changes been made to the program that could have caused an undisclosed error?