On this page you will find an explanation of the ISO 20400 guidance. Is your question not mentioned?

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What role does ISO 20400 play in the supply chain?

Many organizations rely heavily on their supply chains. Typically anywhere from forty to eighty percent of an organization’s turnover runs through the supply chain. Delivering sustainable results via a supply chain where an organization has less influence is challenging and often deemed "too difficult". ISO 20400 is the first international standard in the world that supports organizations in delivering sustainability objectives via supply chains.