01 · The problem
What problem does it solve?
A bracket manufacturer checks every part by eye at the end of the line. Inspectors are good, but a hairline scratch or a faint dent is easy to miss late in a 12-hour shift.
Defective parts reach the customer, the customer sends back a whole batch, and nobody can show which shift, machine or coil the problem came from.
Escaped defects
Parts with defects reach the customer.
Batch returns
One defect sends back a whole lot.
Tired inspection
Attention drops late in the shift.
No evidence
No photos to trace the cause.