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Explanation: I would use this term if referring to the human element in the production process. "Typical defects" would be more appropriate when talking about the faults in the production process itself.
Explanation: "main error" is better than the "focal points ... etc" (A textual translation)
In the food and drug manufacturing/processing industry there is a European Standard for HACCP (I believe HAzardeous Critical ??? Points in such a processing chain (forgot the exact meaning but sure you can find it on the net).
Consequently you may also select "most critical or likely places for defects to occur"
Jacques Van de Velde
Babylon Netherlands Local time: 04:50 Native speaker of: Dutch, French PRO pts in pair: 16