What are some limitations of the of the audit risk model?

Standard setters developed the audit risk model as a planning and evaluation tool. Therefore, the model is only as good as the judgments and assessments used as inputs. Following are some limitations. First, since the auditor assesses inherent risk and control risk, such assessments may be higher or lower than the actual inherent risk and control risk that exist for the client. Second, the audit risk model does not consider the possibility of judgment or nonsampling risk (auditor error in assessing risk, choosing audit procedures, and evaluating results).