Manufacturing guy-at-large.

andon cords

Added on by Spencer Wright.
...It is epitomized in the paradoxical Toyota proverb, “Stop production so that production never has to stop.” The key to the andon cord is that it brings work to a stop as soon as an uncorrectable quality problem surfaces—which forces it to be investigated. This is one of the most important discoveries of the lean manufacturing movement: you cannot trade quality for time. If you are causing (or missing) quality problems now, the resulting defects will slow you down later. Defects cause a lot of rework, low morale, and customer complaints, all of which slow progress and eat away at valuable resources.

 -Eric Ries, The Lean Startup (emphasis mine)