Years ago, I created a simple “spot-the-difference” exercise for the firm where I worked, asking the team to compare two nearly identical images. Roughly one fourth (24%) of those who took the test got it wrong. Half found too few differences, the other half too many.
My point at the time was that if they could not successfully complete a visual inspection on a puzzle designed for children, how could they expect our supply chain partners to be perfect when inspecting our parts. That formed the foundation of a defect containment strategy focused on prevention over inspection.
