Text: Xerox achieves this by building production representative prototypes and by requiring suppliers of key components and subassemblies to produce an adequate sample of parts to demonstrate the suppliers' processes can be controlled, usually before the parts are incorporated into the prototypes.
Entailment: Xerox requires suppliers of key components and subassemblies to produce an adequate sample of parts to demonstrate that the suppliers' processes can be controlled.
Contradiction: Xerox does not require any of their suppliers to produce samples of their parts.