Is anyone really an individual contributor at work anymore? I think not. Pretty much everything we do is done with others in groups. We’re tasked with planning and completing projects together. We negotiate roles and resources. We talk to one another—or text, tweet, email—and sometimes we listen, too. We’re dependent on and beholden to people above, around, and below us for collective success. We develop habits, over time, that dictate how we behave with one another. Add this up and you’ve got the definition of team: people who share a common purpose and goal, who have distinct roles and responsibilities, and who adhere to certain rules of interaction. Teams are everywhere at work. Sadly, though, most of them aren’t terribly effective—or fun.