Например, оптимальное число – 7: Blenko M., Mankins M. C., Rogers P. Decide & Deliver: Five Steps to Breakthrough Performance in Your Organization. Boston: Bain & Company, 2010; оптимальное число – около 5: Hackman J. R., Vidmar N. Effects of Size and Task Type on Group Performance and Member Reactions // Sociometry 33, No. 1 (March 1970): 37–54, doi: 10.2307/2786271.