Variation is built into a process(common causes of variation) External events can cause additional variation (special causes of variation)
“Insanity is doing the same thing over and over again but expecting differentexactly the same results” - Anonymous -
“We hold these truths to be self-evident, that all men are created equal, that they are endowed by their Creator with certain unalienable Rights,that among these are Life, Liberty and the pursuit of Happiness.” - US Declaration of Independence -
Not every method works for everyone.Find those that work for you. Not every method works every day. Be prepared to adopt.