In addition to direct testing of program logic, the auditor can achieve some degree of assurance by reviewing error listings and error logs.
These documents provide evidence of the effectiveness of the data entry process, the types and volume of errors encountered, and the manner in which the errors are corrected and reentered into the system.
Error listings and logs do not, however, provide evidence of undetected errors.
An analysis of error conditions not present in the listing can be used to guide the auditor in designing substantive tests to perform