Authors:
  • motivation is highest when the probability of success is 50 percent: We don't get involved if the task is too easy or too hard.

    Judith M. Bardwick (1995). “Danger in the Comfort Zone: From Boardroom to Mailroom--how to Break the Entitlement Habit That's Killing American Business”, p.63, AMACOM Div American Mgmt Assn