22 Checking the program and using the processed information for auditing will thus generally not give the auditor full confidence in the unbiased operation of the system. This, however, is not peculiar to computer systems. Quite a lot of auditing procedures in them- selves are not sufficient to give full confidence. What is generally done in auditing is to take several complementary approaches to the audit of certain areas, and derive confidence from the combination. The overall View of the consistency of the principal figures is one important aspect.