Hi,

Here is one example of control charts.
http://www.processtrends.com/pg_char...trol_chart.htm

Cheers
Andy
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Andy Pope, Microsoft MVP - Excel
http://www.andypope.info
"Carlos" wrote in message
...
How can I design a Control Chart, i.e., for an Industrial production
statistical control, with its lower and upper limit lines (+ - 3 sigmas)?
Thanks very much.