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Written opinions under these Guidelines shall comply with the following requirements:
- The assurance standards for sustainability metrics by industry under Article 4 of the Governing Rules must be consistent with TWSAE (Taiwan Standard on Assurance Engagement) 3000, Assurance Engagements Other than Audits or Reviews of Historical Financial Information, published by the ARDF, and ISAE (International Standard on Assurance Engagements) 3000 published by the International Auditing and Assurance Standards Board (IAASB).
- The greenhouse gas assurance standards under Article 4-1 of the Governing Rules shall be consistent with one of the following standards, except that where some of the operating locations of a TWSE or TPEx listed company are a source of greenhouse gas emission with its amount of emissions subject to inventory and registration requirement as published by the EPA, the applicable regulations shall be complied with:
- ISAE 3410, Assurance Engagements on Greenhouse Gas Statements, published by the IAASB
- ISO 14064-3, published by the International Organization for Standardization (ISO)
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