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SPC Trick 4, How "Tight" is the Process, and why is that Good? - A Wayworld Tutorial
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Here's a "tight" process.

 

Here's a "loose" process.

Which one is better for a manufacturing process?
Generally, the one that produces the most units near the center target.

A tighter process is good because the more units that are produced near the center target line, the less waste is produced.

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