Believe it or not, this is an actual comment from an QC action log (from a facility that shall remain nameless). At least the author was being honest about how he/she was performing their QC - by luck, not by science. If you still use 2s limits for your controls, you need to read this article. If you still repeat controls and runs until they're "in," you need to read this article. And for anyone who thinks that QC is just fine, you really, really need to read this article. (Preview)