Originally Posted by sassanik
I believe it has to have 60% new material to be a new edition? Have things changed that much in the last few years that a revision of 60% of the information is really needed?
I can't imagine there's anywhere near that kind of requirement based on my experience with new editions that seem to often hardly add anything substantively new. Many are just updated current events examples etc. Much less often do you get new chapters added etc.