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|1. Supplier Tier define the direct (Tier 1) or indirect (Tier 2 onward) supply of product and services to an organization.
2. Supplier Tier is the measure of the distance of a supplier from the organisation.
- Note 1:: A tier 1 supplier directly supplies products or services to the organisation usually through a contractual arrangement.
(Source: ISO 22318 Societal security – Business continuity management — Guidance on supply chain continuity)