Upward Traceability :
- It runs from the raw materials received from the supplier and follows the chain to the finished products delivered to customers.
- Note that the name is confusing - this would often be considered a downsteam direction. Think of it as Where Used.
Downward Traceability :
It follows the product in the other direction, from customer to the different suppliers of raw material.
Note that the name is confusing - this would often be considered an upstream direction. Think of it as Where Supplied.
You can get more idea from this Document.
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