Sweet ...
... Graphic.

There's also Alan Akisson's Diffusion Theory of Innovation, which is sililar but uses the analogy image of an amoeba beginning to move, sending out an early new arm to the new spot to which it wants to move.

One of he things I like best of his model is that the Laggards' name is "Renunciate Curmudgeons" ;-)

Jon Husband