There's no way around it: Every significant human accomplishment is the result of coordinated group behavior—people working together to achieve a common goal. Of course, that reality doesn't change the fact that for lots of people, teamwork is like pulling teeth. Here's why, and what to do about it.

Psychologists know there's a universal human need to belong to groups, but they also know that people aren't always predisposed to working well with each other. Individual interests often sabotage team spirit. People's competitive instincts end up finding targets in fellow team members rather than rival teams.

Via fastcompany.com