The Twelve-Factor App (2011)
I like this in general, but the number of times I've had to delay a release because some non/psuedo-technical person has pulled out "12 factor" like a universal yellow card has been enough for me, overall, to ignore it almost completely. I guess the same has happened to me for "agile" honestly. I recognize the intent of guidelines like these, but they seem to be much more useful to people whose only "value" is to provide ivory tower technical leadership.