Final answer:
The auditor's role includes a cross-check of program changes against in-use programs.
Step-by-step explanation:
The auditor's role in reviewing the system of computer program development includes a cross-check of program changes against in-use programs. This means that the auditor will compare the changes made to the program with the current version being used. This is important to ensure that the changes are accurately implemented and do not cause any issues or conflicts.
However, the auditor's role does not typically include checking to see that all program changes are properly documented, checking the librarian functions, or checking to see that program change requests are properly costed. These tasks are usually the responsibility of the development team or other individuals involved in the development process.