If anyone has any questions I didn't answer, please ask them on this thread. I still consider this essay a draft; if anything important comes up here, I'll incorporate it in the next version.
A question that is not directly related: You said My initial goal is to figure out what kind of group I'm dealing with. Three friends about to graduate from college? Two colleagues who work together at a big company and want to jump ship? Are they all programmers? A mix of programmers and business people? There are maybe 20 or 30 different configurations of founders, most of which I've probably seen by this point. Is…
The reason I want to know the type of group is that it helps me to interpret the answers to the other questions. E.g. if the founders are undergrads, I shouldn't have as high standards for what they've achieved; if they're colleagues who worked together, I'm curious about whether the idea grew out of some need they had at work; etc.
If you want to know who to pick as cofounders, pick people who are smart and energetic and that you can work well with. Also try to pick people you've known for a while. You need more holding you together than the startup, because there will probably be some point when you dip below the x axis and the startup seems worthless.