(14)In order to enhance the credibility and transparency of the quality assurance reviews performed in the Union, Member States' quality assurance systems should be governed by the competent authorities designated by the Member States to ensure public oversight of statutory auditors and audit firms. Quality assurance reviews are designed to prevent or address potential deficiencies in the manner in which statutory audits are carried out. In order to ensure that the quality assurance reviews are sufficiently comprehensive, the competent authorities, when carrying out such reviews, should take into account the scale and complexity of the activity of the statutory auditors and the audit firms.