We all make mistakes. Small ones. Big ones. Some have immediate implications (you forget to look both ways and pull out of an intersection only to end up in a car accident), while some implications aren’t realized until weeks or months later (a hinge or nut is not tightened to the right specification and comes loose over time before falling off). When it’s in your home, the impact may be minor and of short duration, but when it happens on a manufacturing line, the impacts can be significant. But all too often, these mistakes go unnoticed and undetected. How can you fix a problem if you don’t know what caused it in the first place?