A user interface is well-designed when the program behaves exactly how the user thought it would.

It's harder to read code than to write it.

Something is usable if it behaves exactly as expected.

Remember, just because Microsoft can do something, doesn't mean you can. Microsoft makes their own gravity. Normal rules don't apply to them.

Watching nonprogrammers trying to run software companies is like watching someone who doesn’t know how to surf trying to surf. Even if he has great advisers standing on the shore telling him what to do, he still falls off the board again and again.

If your goals is to produce something of permanent value, you start to think differently about you want on the site.

There's a subtle reason that programmers always want to throw away the code and start over. The reason is that they think the old code is a mess. [...] The reason that they think the old code is a mess is because of a cardinal, fundamental law of programming: It's harder to read code than to write it.