I’ve been using the Microsoft Office 2010 beta for a few weeks now, and I’ve got a few comments about the user interface. But before I tackle that, I want to talk about card games. Stay with me, this is related to user interfaces.
Let’s take a look at two card games. Both these are from Rio Grande Games, and both are excellent in their own way.
Dominion is a card game where the object is to build a large deck of cards, gathering victory point cards along the way. The rules are very simple, and can be boiled down to: play one action, buy one item, discard, then draw five cards. There are nuances, of course, but that’s pretty much the basic rule set. The real rules, of course, are on the cards themselves.

If you look at the Festival (action) card, you can see that it modifies the basic rules by allowing you to play additional actions, buy more stuff, and gives you more money to buy more stuff. What the Festival card does is overload your abilities for a turn.
Now let’s look at another card game: Race for the Galaxy.