Information on how the bandplans work and how to apply them practically, figuring out which one works, is kind of scarce and hard to find. It would be handy if there was a convenient resource available to us that would shed some light on this somewhat mysterious subject.
But then again, I don't encourage people to apply the NAS approach anymore, given how much things have changed since the method was first described. It's just not the same world as it was back then. It's less safe for those who choose to use a public safety radio as as scanner.