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The first reference link, "Six Sigma SPC's Quality Control Dictionary and Glossary". Design Life. Retrieved 17 June 2006 ( http://www.sixsigmaspc.com/dictionary/designlife.html ) leads to some horrible ads that redirect you away from the desired page. I don't think this is an appropriate link to keep, unfortunately. — Preceding unsigned comment added by 132.181.53.120 (talk) 22:42, 19 October 2016 (UTC)