This series is not finished and, due to the complexity of the subject, will be updated and rewritten over the next few years until the author retires in 19 years' time!
We want to/must do SPC!
Nice question. One of the buzzwords of Q-DAS software. And we have no competition here. Why? This article will show you why. Because no other software house understands the topic like we do. Software house! Not software! Software only offers technical possibilities. Knowing them, being able to use them and understanding them is something else.
Of course, the glossy homepage states that the qs-STAT and O-QIS tools are "SPC tools". There is nothing technically wrong with that. Philosophically it is.
A "how to" for SPC.... Aren't there already enough books about it? Writings, expert powerpoints? Of course there are! Google it and you'll spend the rest of your life reading up on "expert knowledge". Discussions in forums about whether you still use run/trend/middle third today, formulas for control charts...
But where do you start? The author has decided to write this "How to" in the same form as he gives his own training. No formulas. No reference to standards / guidelines. An article to think about! A "how to"? Yes. But a "How to think!". Written like the spoken word, no beautiful prose, no formulas!
And I am not afraid of resistance. Because as Luther once said: "Here I stand and cannot do otherwise, until someone proves me wrong"
The words written here are solely those of the author, after 19 years of experience at Q-DAS and almost 30 years in this industry. Regardless of any standard or requirement from the customer, with an eye on the reality at the customer's site, where written requirements are unfortunately only patient paper.