After devoting nearly 50 years to studying team performance, the late Harvard researcher J. Richard Hackman concluded that four to six members is the team best size for most tasks, that no work team should have more than 10 members, and that performance problems and interpersonal friction increase “exponentially as team size increases.”

Bob Sutton, “Why Big Teams Suck

For anyone who works with  me and wonders why I’m not more “inclusive”.