Interesting stuff, but like all advice, it's hard to know <i>exactly</i> how to apply it. That is, saying "Ask yourself how that's working for you and be willing to change directions quickly" is good advice sometimes... but other times, "be persistent and stay the course and keep pounding away" may be equally good advice. The question is, how do you <i>know</i> ahead of time, which scenario you're in? And the answer, I think, is that you really can't. It's a judgment call.<p>This is one of the things about running a startup (or, really, doing anything in life) - you can get well meaning, quality advice from different people, where the two bits of advice are completely contradictory. So in the end, you just have to decide.