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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.
- 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 Ministry of Environment, the applicable regulations shall be complied with:
- TWSAE 3410, Assurance Engagements on Greenhouse Gas Statements, published by the ARDF
- ISO 14064-3, published by the International Organization for Standardization (ISO)
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