I've found people have to want to learn it on their own. GTD is not something you can force people to learn.

It's probably best to suggest things like, "I've found that if I write stuff down, I'm better able to remember stuff, and therefore I can use my brain to come up with new ideas rather than try to remember everything."

I think this topic came up in the podcast series where Merlin interviewed David Allen, in the one about GTD and Groups.

It's really one of those "lead by example" things. Unless someone out there has successfully broached the topic to other people. I'd guess it's probably easier with a spouse than with a workgroup.

If you're a project manager or something, then it's probably a lot easier to just call it a new workflow policy, but I wouldn't want to make it too strict, because then people would rebel against it.

What exactly are you trying to do? (That probably should've been the first thing to go here.)