What is Backward Trace?
Backward Trace
Traceability from product to material.
What it means
A backward trace starts from the LOT number of the product in question, traces back to the LOT of materials that went into that product, the order that those materials came from, and the supplier.
Used when asking “Why is this product like this?”
At the pen factory
I look at the refill starting from the ballpoint pen L-1109-2 that has not come out for 10 days. 40 pieces of L-1103 from Daehan Refills and 60 pieces of L-1109 received through miscellaneous receipt.
Why it matters
To find the cause, you must first know what the product is made of.
How this differs from Forward trace
The backward trace is product → material (direction to find the cause), and the forward trace is material → product (direction to find the scope).