Use the 6M fishbone categories to widen root-cause thinking for a glass defect before selecting countermeasures.
The move: widen the cause map before narrowing the investigation. Define the effect precisely A fishbone begins with the problem statement. In glass work, "bad quality" is too broad. Use a defect, line, product, time window, and size: "stones on 750 ml amber Line 3, 1.4% from 08:00 to 12:00." Use 6M as prompts, not boxes to fill mechanically Materials asks about batch, cullet, contamination, colorant, and moisture. Machines asks about furnace, feeder, molds, conveyors, inspection equipment, and maintenance condition. Methods asks how the work is performed. Measurement asks whether the data is trustworthy. Manpower asks about training, handoffs, and…
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