“We have a problem with consistency,” Donna said. “I think everything is going okay and then boom, we get hit with a warranty event that uncovers a whole batch of bad product. I have two people doing random inspections prior to shipping. Still, mistakes get through. I might have to add more inspectors, check everything, just to keep bad product off the shelves.”
“What do you do with the bad product?” I asked.
“Well, we can’t sell it and we can’t melt it down, so we throw it away,” replied Donna.
“Do you use bad product to isolate the problem production area?”
“Oh, we know the three areas where we have problems, but rather than pull bad product in three places, I thought it best to inspect just before shipping, so we can pull all the bad product at the same time, no matter where the problem occurred.”
I winced. “Donna, is the purpose of Quality Control to pull bad product, or to identify the problem and fix it? Consistency doesn’t come from pulling 3 percent of your production. Consistency comes from fixing your system.”