Is zero defect a realistic quality objective?
I’ll take the unpopular route here and say that zero defect is absolutely a realistic quality objective. I hope that anyone who disagrees with me doesn’t work for an airline. I do agree that the cost of a zero defect environment is generally beyond the budget and time of most projects, but outside of essential infrastructure, the airlines, and a few other industries I don’t think the demand for zero defects exists. Each project is in response to a demand, and while zero defect may be the communicated goal near zero defect is likely to also be acceptable. Just noticeable difference (JND) is ΔI/I=K. As long as the margin of error is below the JND it doesn’t really matter because it’s likely to not be noticed.