Discussion
A sudden rise in reject rate accompanied by no change in the process is best investigated by
Answer: C
Correct answer: checking the incoming raw materials first
A step change in rejects with no change in the process points to a change in something entering the process, and the raw materials are the largest and most variable input - a new clay lot, a different consignment of feldspar, a shift in moisture. Checking them costs a morning. Altering the firing to compensate would mask the cause and leave the plant permanently mis-set once the material changed back.
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