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Article 17
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For audits of the implementation of audit plans by the internal auditors of a TWSE primary listed companyor a TIB primary listed company, the random case selection rate is at least 25 percent per quarter in principle.
Instead of conducting the audit referred to in the preceding paragraph, the TWSE may use the CPA internal control system audit report of the previous year presented by the company under Article 4 of these Rules. If the fiscal year for the selection of TWSE primary listed companies and TIB primary listed companies whose internal control systems are to be audited by the TWSE is the fiscal year of initial listing, the period covered by the internal control system audit report may be determined by the Procedures for Reviewing Internal Control System Audit Reports Issued by Certified Public Accountants.
Where a material unexpected incident occurs to a TWSE primary listed company or a TIB primary listed company,or where the competent authority or the TWSE deems it necessary for other reasons, the TWSE may examine the effectiveness of the design and implementation of said company’s internal controls.
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