“From elementary school through college, girls are more disciplinedabout their schoolwork than boys; they study harder and get better grades. Girls consistently outperform boys academically. And yet, men nonetheless hold a staggering 95 percent of the top positions in the largest public companies.

What if those same habits that propel girls to the top of their class — their hyper-conscientiousness about schoolwork — also hold them back in the work force?

When investigating what deters professional advancement for women, the journalists Katty Kay and Claire Shipman found that a shortage of competence is less likely to be an obstacle than a shortage of confidence. When it comes to work-related confidence, they found men are far ahead. “Underqualified and underprepared men don’t think twice about leaning in,” they wrote. ‘Overqualified and overprepared, too many women still hold back. Women feel confident only when they are perfect.’”