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Throughout the statement, M&S dictates the variety of methods they have in place to monitor suppliers. Many of them boil down to audits, self reporting, but also rely on individual reporting in the case of any issues.
Conducting audits of suppliers on page 9, the document states:
"We use a range of tools to assess and manage risk in our supply chain, including:
Ethical audits" This indicates that M&S conducts audits of their suppliers.
Conducting on-site visits of suppliers is also on page 9, the document mentions:
"We use a range of tools to assess and manage risk in our supply chain, including:
Announced, semi-announced and unannounced site visits"
the document mentions other continuous engagement mechanisms: "Worker interviews" , "Grievance mechanisms"