" Hewlett-Packard conducted a study to figure out how to get more women into top management. These numbers say it all: The authors found that the women working at H-P applied for promotions only when they believed they met 100 percent of the qualifications necessary for the job. The men were happy to apply when they thought they could meet 60 percent of the job requirements. So, essentially, women feel confident only when we are perfect. Or practically perfect. Underqualified and underprepared men don’t think twice about leaning in. Overqualified and overprepared, too many women still hold back. And the confidence gap is an additional lens through which to consider why it is women don’t lean in. Even when we are prepared to tolerate the personal disruption that comes with aiming high, even when we have plenty of ambition, we fundamentally doubt ourselves. "

― , The Confidence Code: The Science and Art of Self-Assurance – What Women Should Know