Suppliers shall establish and implement an effective program to ensure that their supply chains are in conformance with this specification.3.4.1 Sub-tier Supplier Management GuidelinesA sub-tier supplier is defined as a manufacturer that supplies components or materials to a Microsoft contracted supplier for incorporation or use with Microsoft branded devices. Sub-tier suppliers do not have a direct contractual relationship with Microsoft.Each of Microsoft’s directly contracted suppliers is expected to have a supplier management system for its sub-tier suppliers that covers, but is not limited to the following aspects: