This metric is intended to capture the number of enterprises with social or environmental certifications that supplied goods or services to the reporting organization during the reporting period.
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Organizations can themselves determine the precise threshold at which they report suppliers. In most cases, organizations should include only those enterprises supplying goods and services that are fundamental to the operations of the reporting organization.
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Social or environmental certification indicates that a third party organization has verified that the supplier meets certain social or environmental standards. See here for examples of social and environmental certifications.