INFO THEORY:The Story of Two Things story according to Glen Whitman:
A few years ago, I was chatting with a stranger in a bar. When I told him I was an economist, he said, “Ah. So… what are the Two Things about economics?”
“Huh?” I cleverly replied.
“You know, the Two Things. For every subject, there are really only two things you really need to know. Everything else is the application of those two things, or just not important.”
“Oh,” I said. “Okay, here are the Two Things about economics. One: Incentives matter. Two: There’s no such thing as a free lunch.”
Ever since that evening, I’ve been playing the Two Things game. Whenever I meet someone who belongs to a different profession (i.e., a profession I haven’t played this game with), or who knows something about a subject I'm unfamiliar with, I pose the Two Things question. I also posed the Two Things question on my blog, where it elicited many responses in the comments section and on other blogs. This page is a collection of responses to the "Two Things" question, collected from various pages on the web, with credit given when possible.
The two things about data visualization and interfaces? I'd say:
1) Simplify, but empower the user simultaneously.
2) Treat the user's computer screen like a new acquaintance's home. Act respectful; don't take over the place.