But that's the thing: I don't think most people realize that the phrase is a hierarchy. They just think it's a flat list of things you can do. At least that's how I was taught and other places (like the EPA website) imply.
325 karma · joined May 1, 2011
If you do that, you can also get the book in ePub or Mobi format.
Also note that the article itself is from January 2014.
There is some other good stuff at that site.