How it was documented and How it was supported are the frames that always bring me a grin. I still like the r-rated troubleshooting flowchart better for humors' sake.
If you follow the link to the google results and hit images to see that one, I hope it's okay on this site.
It is so old that when I first saw it there weren't any programmers or analysts - it was engineers and draftsmen! I think the consultant was a salesman, and so on.
Which just goes to show you, the more things change, the more they stay the same!