Four-stages-of-functional-programming

After I read that I poked around and also saw this about using "push" and "pull" to describe "framework" vs. "library" and I like it too:

http://pchiusano.blogspot.com/2010/09/push-libraries-vs-pull...

And this...

http://pchiusano.blogspot.com/2010/07/reification-of-time-in...