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Process Variation

inputs              outputs

 x1 -> +---------+ -> y1
 x2 -> | Process | -> y2
 x3 -> +---------+ -> y3

 QA                   QC

The above process model could for instance be for an injection moulding process. On the input side we would have some process parameters like temperature, pressure, humidity, and timing. On the output side the dimensions of the part being moulded, which we can call attributes of the part.