I think one unraised question is: what do you do once you have a potential cofounder? Do you interview them? How do you figure out if this is going to work? Is

I think one unraised question is: what do you do once you have a potential cofounder? Do you interview them? How do you figure out if this is going to work? Is it all on instinct? In my case it's been the latter, mostly, but I think it would have been better in retrospect to work on something together - these hack days/weekends/Launch48 etc sound ideal - before bringing him into a business I'd founded. Then I would have had more of an idea how to establish the relationship formally within the business too; doing it casually has its downsides, especially if you're not in the lifelong friends situation.