C1: Audit Sampling - Larry Whittington –( All)

Auditors know it may not be practical to examine all available evidence due to its volume and dispersal. In those cases, a sample is selected to evaluate against the audit criteria and form the audit conclusion.

The risk is that the sample may not be representative of the total set of people, documents, practices, and records being assessed. As a result, the audit conclusion may be different than if the auditor had examined the whole population. So, we may over-audit by taking samples that are too large and waste time and resources. Or, we may under-audit by taking samples that are too small and end up not detecting nonconformities.

This session will discuss selecting samples, sizes, and timeframes; conducting convenience, haphazard, judgmental, systematic, and statistical sampling; and reporting sampling methods with disclaimers.

It is important to apply the appropriate use of sampling since it is closely related to the confidence that can be placed on the audit conclusion.