itwbennett writes "If you've ever worked on a team you can probably recall a time when, as a group, you produced work that was not as good as any one of you could have done on your own. Sarah Mei had this sort of sub-par teamwork experience, which she shared in her session at the O'Reilly Fluent Conference this week. Mei 'spoke about a time she worked on a team with really expert developers. Every one of them was someone whom you'd admire, who had previous written code that you and I would boast to have created. Yet, these smart people created modules that didn't talk to each other. And its quality was, to be kind, on the rotten side.' It's not an uncommon story, but why and how does it happen? The answer, says Mei, is that code quality 'is defined by its patterns of dependencies,' not all of which have equal weight. And, as it turns out, team communication is the heaviest dependency of all."