Geoffrey Withnell


  • tgause:

    In regard to spec limits on a control chart, one thing they most certainly do NOT do, is help determine if a process is in control.  A process is in control when the process inputs are all normal cause inputs, and there are no special causes creating unusual variation.  This has nothing to do with the specification.  A process can be in…[Read more]

  • Geoffrey Withnell became a registered member 2 years, 9 months ago